XueyueKJ 3pcs 3-12mm 4-12mm 4-20mm Step Drill Bit Titanium Nitride Coated Set Steel Groove Step 1/4\" Shank Hole Cutter Core Drill Bit Set Auger Drill Bits, Brad Points  (Pack of 1)

Features: *100% Brand New and High Quality *This compact Set Replaces 28 Individual Drill Bits *Automatically Deburrs Holes as you Drill *Titanium Nitride Coating for Cooler Running *Quick-change 1/4" Hex Shank *High Speed Steel for Long Life *These Step Drill Bits are ideal for variety of materials from metal, plastic, fiberglass to wood *They also help to enlarge existing holes *The two flute design tips made the penetration faster without chipping Specifications: *Material:Titanium Nitride Coating,High Speed Steel * Sizes of the 3 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" Package Contents: 3pcs Drill Bits