General high-speed steel drills are only suitable for drilling holes in materials with hardness below 40HRC. When the material hardness exceeds 45HRC, cobalt-containing HSS drills can be used to drill holes. When the material hardness exceeds 50HRC, generally only carbide drill bits can be used for drilling. Especially suitable for drilling stainless steel.
Carbide multi-function drills can be used to drill holes in cast iron, wood, abrasives, plastics and other materials, a drill multi-purpose, widely used in machinery manufacturing, mold manufacturing and repair, automotive maintenance, construction, bridges, decoration and other industries, while suitable for home standing tools.

Straight Shank Twist Drill is mainly composed of shank and working part, the cutting part of the work has two main cutting edges and secondary cutting edges, which is responsible for all the cutting work, the guiding part of the working part has the role of guiding and preparing for grinding, the chip holding groove is made into a helical shape in order to facilitate the chip guiding, it is made of M35 high speed steel, fully ground drill bit, with high grinding precision, sharp and durable cutter, it is widely used in drilling holes in stainless steel plate, spring steel for automobiles, abrasives and other high-hardness plates. Drill holes.