The heavy-duty Dremel Max Premium Cutting Wheel SC456DM is is coated with super abrasive grit called cubic boron nitride (CBN) which provides maximum durability allowing the wheel to remain sharp longer, stay cool, and prevent shrinking. The Max Premium Metal Cutting Wheel lasts 20 times longer than the regular 426 Cutting Wheels and is reinforced with a metal core to prevent breaking. The high-performance cutting wheel features a 38.1 mm diameter and 1 mm thick blade making it ideal for cutting a variety of materials including stainless steel, nails, rebar, metal studs, threaded rod, copper, conduit, metal HVAC ducts, metal door jambs, and galvanized strut. The SC456DM is designed with the patented EZ SpeedClic system making accessory changes quick and easy.Features Cutting wheel with maximum durability and lasting performance for demanding cutting jobs that require precision Coated with Cubic Boron Nitride (CBN), an abrasive grit allowing the wheel to remain in shape and stay cool without shrinking Cut a wide range of materials including stainless steel, nails, rebar, metal studs, copper and more Use with SC402 Mandrel. The Dremel exclusive Easy Speedclic (SC) mechanism, makes wheel changing keyless, easy and fast: PULL - TWIST – RELEASE. It makes accessory changes 6X faster than using a standard mandrel (EZ SpeedClic mandrel SC402 sold separately)