Part number, #4-2CJR6
Step Drill Bit
IRWIN
Cobalt, Black Oxide
Drills holes, 3/16" to -7/8"
12 Hole Sizes
Speedpoint
Starts fast!!
Hole sizes:
3/16 in, 1/4 in, 5/16 in, 3/8 in, 7/16 in, 1/2 in, 9/16 in, 5/8 in, 11/16 in, 3/4 in, 13/16 in, 7/8 in
Shank Type: Straight with Three Flats
Shank Diameter: 3/8"
Overall Length: 2-7/8"
FOR:
Aluminum, Brass, Copper, Laminate, Steel, Plastic, Stainless Steel, Hardened Steel, Wood
The shanks on these step drill bits have three flats that help prevent the bits from slipping in the drill chuck during drilling.
These cone-shaped bits have steps of increasing diameter marked along their cutting head.
As each bit is pushed into a piece of sheet metal or other thin material, each step on the bit widens the hole.
The bits also have a self-starting split point that prevents the bits from moving, or walking, when starting to drill, which eliminates the need for using a center drill to create a starter hole before drilling.