Irwin® Unibit®, 10225, Step Drill Set, Self-Starting, Imperial System of Measurement, #21 Minimum Drill Bit Size, #1 Maximum Drill Bit Size, 4 Piece, Specifications: 3-Flat 7/16 in Hex Shank, Standard Point, 3-1/2 in L, HSS, Uncoated, Black, 3-1/2 in L Dimensions
The IRWIN Unibit High-Speed Steel Step Drill Set features single-flute cutting edges for greater control and more precise drilling. Three-flatted shanks prevent the bits from slipping in the drill while the non-skid self-starting tips eliminate skidding and the need for center punching. Set includes #1, 2, 4, and 21 size step drills.
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