★Outspot★, a professional Amazon marketplace seller, was established to bring exciting quality brands to people through a variety of different solutions. We are passionate about excellence, so for every Outspot purchasing, you can expect to get the highest importance, qualified products with really good price and amazing after-sales service, no matter how big or small. Description： - 100% brand new and high quality - Drill 28 Hole Sizes - This compact Set Replaces 28 Individual Drill Bits - Automatically Deburrs Holes as you Drill - 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 - 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 Specification 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"