2 Sets to Choose From 3pcs mm set or 3pcs U.S. Standard set, Both come with Pouch Features: 100% quality and Brand new. 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 2 choices below with measurements.. you choose between sets, Specification: USA STANDARD SET 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″ Weight :0.11kg Specification: International MM SET..Material: HSSType: 4-20/3-12/4-124-20: 9steps-4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm3-10: 10steps-3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm4-12: 5steps-4mm,6mm,8mm,10mm,12mm Package Included: 3pcs Drill Bits w/ pouch.. you choose set size