The heavy-duty Dremel Max SC456DM Premium Cutting Wheel is is coated with super abrasive cubic boron nitride (CBN) grit . This provides maximum durability, allowing the wheel to remain sharp for longer while staying cool, and prevents it from 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. How to use: Use with SC402 Mandrel. The Dremel exclusive Easy Speedclic (SC) mechanism, makes wheel changing keyless, easy and fast. Make cuts with the edge of the cutting wheel. We recommend using a (two-handed)