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Specifications: Step Drill Bit Set: Quick-change 1/4" Hex Shank Titanium Nitride Coating for Cooler Running Two-flute Design Provides Faster, Smoother Cutting Automatically deburrs holes as you drill Sizes of the 3pcs Step Drill Bits: 6 Step Bit from 3/16" to 1/2" 9 Step Bit from 1/4" to 3/4" 13 Step Bit from 1/8" to 1/2" Automatic Center Punch: Knurled handle to confirm grip Use the impact of body to generate power to punch Automatic design,punch holes,wood and plastic materials in the steel cleanly and accurately Body Material: brass structure Cutting-edge Material: high-speed steel (hardness HRC58-62°) Overall length: approx. 130mm Package included: 3pcs Step Drill Bits 1pc Auto Center Punch