-Includes : 2x cobalt step drill bits ( 4 - 20 mm & 6 - 35 mm ).-New Aluminium Chromium Nitride (AlCrN) coating for 10x more life vs. MILWAUKEE® standard step drill.-For steel and stainless steel.-RAPID STRIKE TIP™: Accurate start without walking and fast drilling without the need to pre-drill the material.-Special tip and step geometry for jam-free performance - less risk of drill snagging when used with cordless tools and also prevents deformation of the drilled material.-Optimised 2 flute ground sharpened edge geometry for 2x faster and smoother cutting.-With 3 flat secure grip to prevent step drill from slipping in the chuck and ensure maximum transmission of torque.-Laser engraved size markings for best long term visibility.