Milwaukee 48899350 Step & Drill Bit 10 Pc Combo Set This 10 piece set includes a combo of step drills and drill bits, and is suitable for a variety of trades - including electrical, plumbing, metal work, automotives and maintenance repairs. It features step drills, which are ideal for drilling into materials such as copper, brass, stainless steel and plastics. Step drill bits also have a number of advantages over conventional drill bits - they are more durable, more accurate and provide much cleaner holes.  CONTENTS 2x Step Drill Bits: 4-12mm 4-20mm 8x THUNDERWEB Metal Drill Bits: 2x 2mm 2x 3mm 2x 4mm 1x 5mm 1x 6mm FEATURES Spot drill, drill and deburr all in one go Rapid strike tip for improved centering - less walking and fast drilling without the need to punch or pre drill the material Special tip and step geometry for jam-free performance - less risk of drill snagging when used with high speed cordless tools and also prevents deformation of the drilled material Optimised 2 flute ground sharpened edge geometry for 2x faster and smoother cutting Produced from custom engineered steel with black oxide coating for 4x longer life Optimised for use with high speed cordless drills Laser engraved size markings for best long term visibility Each step is relief ground to drill and deburr automatically With 3 flat secure grip to prevent step drill from slipping in the chuck and ensure maximum transmission of torque