1/4" Hex Shank Quick Change Titanium Uni Step Drill Bit Set , 3 Pics , 3/16" -1/2" ,1/4"-3/4" ,1/8"-1/2" This compact Set Replaces 28 Individual Drill Bits.Drill 28 Hole Sizes Two-flute Design Gives You Faster, Smoother Cutting Titanium Nitride Coating for Cooler Running Quick-change 1/4" Hex Shank High Speed Steel for Long Life