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Product Overview

Tackle metal drilling tasks with this 21-piece M35 cobalt drill bit set, designed for precision drilling in a variety of metal materials. Featuring a cobalt steel construction and a titanium aluminum nitride (TiAlN) coating, these drill bits are suitable for workshop projects, metal fabrication, maintenance, and general drilling applications where heat resistance and accurate hole placement are important.

The set includes commonly used fractional inch sizes ranging from 1/16 inch to 1/2 inch, with duplicate bits provided for selected smaller diameters. A combination of self-centering pilot point geometry and a 135-degree split-point design on applicable sizes helps improve starting accuracy and reduce bit wandering during drilling.

Designed with thin sheet metal and harder metal surfaces in mind, this assortment offers a practical selection of drill bits for users who need multiple sizes in one organized kit. The included storage case keeps the bits arranged for convenient identification, transport, and storage.

For best results, select the correct bit size, use an appropriate drill speed for the material, and apply suitable cutting fluid when recommended for the workpiece.

Key Features & Benefits

  • 21-Piece Drill Bit Set: Includes a selection of commonly used sizes for a range of metal drilling tasks, with duplicate smaller bits for added convenience.
  • M35 Cobalt Steel Construction: Designed for drilling applications involving metal materials that require heat-resistant cutting tools.
  • TiAlN Coating: Titanium aluminum nitride coating provides a wear-resistant surface designed for demanding drilling conditions.
  • 135-Degree Split Point: Helps the bit engage the workpiece more efficiently and supports accurate hole starting on applicable sizes.
  • Self-Centering Pilot Point Design: Helps reduce bit wandering when starting holes in suitable materials.
  • Bullet-Shaped Tip: Selected sizes feature a bullet-style tip geometry designed to assist with positioning and penetration.
  • Fractional Inch Sizes: Covers a range from 1/16 inch to 1/2 inch for different hole diameters.
  • Suitable for Metalworking: Intended for drilling tasks involving compatible metals, including sheet metal and selected harder metal materials.
  • Organized Storage Case: Keeps drill bits separated and arranged for easier size identification and transport.
  • Workshop Versatility: Suitable for maintenance, repair, fabrication, and DIY metalworking projects.

Multiple Uses / Applications

This cobalt drill bit assortment can be used for a variety of drilling tasks when paired with a compatible drill and the correct operating technique.

  • Sheet Metal Drilling: Create holes in suitable thin metal sheets for fabrication and assembly projects.
  • Stainless Steel Projects: Drill compatible stainless steel materials using appropriate speeds, pressure, and cutting lubrication.
  • Metal Fabrication: Prepare holes for fasteners, brackets, fittings, and other metal components.
  • Workshop Maintenance: Support repair and maintenance work involving compatible metal parts.
  • Automotive Projects: Assist with suitable metal drilling tasks during vehicle maintenance and fabrication.
  • DIY Projects: Handle common drilling requirements for metalworking and home workshop activities.
  • Equipment Assembly: Create holes in compatible metal components for installation and assembly purposes.
  • General Workshop Use: Keep a range of drill bit diameters available for different project requirements.

Material hardness, thickness, and workpiece shape can affect drilling performance. For harder materials, use appropriate cutting speeds, secure the workpiece firmly, and follow the recommended drilling procedure.

Product Details / Specifications

  • Product Type: Cobalt metal drill bit set
  • Set Quantity: 21 pieces
  • Material: M35 cobalt steel, as specified
  • Surface Coating: Titanium aluminum nitride (TiAlN)
  • Size Range: 1/16 inch to 1/2 inch
  • Tip Design: Combination of standard and bullet-shaped tips
  • Point Angle: 135-degree split point on applicable sizes
  • Primary Application: Metal drilling
  • Suitable Materials: Compatible sheet metal, stainless steel, and other suitable metals
  • Storage: Compartmentalized carrying case with size labels
  • Package Contents: 21 × Drill Bits and 1 × Storage Case

Included Drill Bit Sizes

The set covers 16 nominal fractional inch sizes, with five additional duplicate bits among the smaller diameters.

  • 1/16 inch
  • 5/64 inch
  • 3/32 inch
  • 7/64 inch
  • 1/8 inch
  • 9/64 inch
  • 5/32 inch
  • 11/64 inch
  • 3/16 inch
  • 13/64 inch
  • 7/32 inch
  • 15/64 inch
  • 1/4 inch
  • 5/16 inch
  • 3/8 inch
  • 1/2 inch

Tip configuration: Sizes from 1/16 inch through 1/8 inch use a standard tip design, while sizes from 9/64 inch through 1/2 inch feature a bullet-shaped tip design, as specified.

Usage and Maintenance Instructions

  1. Select a drill bit that matches the required hole diameter and material.
  2. Secure the workpiece firmly before drilling, particularly when working with thin sheet metal.
  3. Mark the drilling location and position the bit carefully before starting.
  4. Use a suitable drill speed and steady, controlled pressure for the material and bit diameter.
  5. Apply appropriate cutting fluid when recommended to manage heat and cutting friction.
  6. Avoid excessive pressure, which can damage the cutting edge or deform thin materials.
  7. Allow the bit to cool when necessary and clean it before returning it to the storage case.
  8. Wear suitable eye protection and follow the safety instructions for your drill and workpiece.

Drill bits can become hot during use. Allow them to cool before handling, and keep hands clear of rotating components. Always use the appropriate protective equipment for the task.

Shipping Policy

Orders are processed and dispatched within the handling time specified on the listing. Delivery times may vary depending on the destination, shipping service, and carrier operations.

Please verify your shipping address before completing checkout. Tracking information will be provided through eBay when available.

If your parcel is delayed or arrives with a delivery-related issue, please contact us through eBay messages first. We will review the information and assist you with the appropriate next steps.

Return Policy

Returns are accepted only for items that arrive damaged or faulty.

If your drill bit set arrives damaged or contains a faulty item, please contact us through eBay messages and describe the issue. Where possible, include clear photographs of the affected components and packaging to help us assess the situation.

Please contact us before returning an item so the issue can be reviewed and the appropriate return arrangements can be discussed in accordance with the listing terms and applicable eBay policies.

Payment Policy

Payment is required at checkout when placing your order. Please use the secure, eBay-approved payment methods available during checkout.

Before completing your purchase, review the bit size range, material, coating, tip configuration, and included accessories to ensure the set is suitable for your intended drilling applications.