One piece of New Spiral Titanium Coated Step Drill Bit that covers 10 sizes. This Step Drill Bit is ideal for variety of materials from metal， plastic， fiberglass to wood. They also help to enlarge existing holes.Features:10 hole bit sizes:1/4"3/8"1/2"5/8"3/4"7/8"1"1-1/8"1-1/4"1-3/8"With 1/8 inch incrementsHeat Treated HSS with Titanium Nitride CoatingPackage Included:1 x HSS drill with packing box