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IRWIN Step Drill Bit: 12 Hole Sizes, 3/16 in to 7/8 in, 1/16 in Step Increments, Black Oxide Finish

Item 
6A922
Mfr. Model 
UNIBIT 4

Product Details

Catalog Page
672
Brand
IRWIN
Number Hole Sizes
12
Minimum Hole Size
3/16 in
Maximum Hole Size
7/8 in
Material - Machining
High Speed Steel
Drill Bit Sizes Included
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
Decimal Equivalent
0.1875; 0.25; 0.3125; 0.375; 0.4375; 0.5; 0.5625; 0.625; 0.6875; 0.75; 0.8125; 0.875
Measurement System
Fractional Inch
Step Increments
1/16 in
Shank Type - Machining
Straight with Three Flats
Shank Diameter
3/8 in
Overall Length
2-7/8 in
Maximum Drilling Depth
1/8 in
Finish - Machining
Black Oxide
Impact Rated
No
Primary Material Application
Aluminum; Brass; Copper; Laminate; Plastic; Steel; Wood
Series
UNIBIT
Sub Brand
Unibit
UNSPSC
27112801
Country of Origin
USA (subject to change)
Product Description

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.