Step drill bit sets contain multiple bits in different sizes for creating holes in a range of sizes. 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. Most of the bits in this set 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.

The Unibits that are included in this set are: 10239sm(#9, 7/8" - 1-1/8"), 10502ZR (#1, 1/8" - 1/2", #2 3/16" - 1/2", #3 1/4" - 3/4"), 10234 (#4 3/16" - 7/8"), 10311 (#11 7/8"), 15101 (#1T 1/8" - 1/2")

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