The SC545DM Diamond Wheel is engineered to last 3 times longer compared to the regular 545 wheel. The cutting wheel is completely coated with fine diamond particles to cut through hard materials. This wheel is ideal for cutting in hard and abrasive materials like marble, concrete, brick, porcelain, ceramics, hard epoxy, and soft or hard wood. The SC545DM features a 38.1mm diameter and is designed to work with the EZ SpeedClic system, making accessory changes especially quick and easy. How to use: 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). Make cuts with the edge of the cutting wheels. We recommend using a (two-handed) golf grip when using this accessory. Let the accessory do the work without putting too much pressure on it or exceeding the maximum RPM to have the accessory l