545 Diamond Wheel for Dremel Rotary Tool & 10PCS Diamond Blade 22mm with 2PCS 402 Mandrel 3mm Material: Carbon steel, strong and durable Cutting discs diameter: 22mm, Thickness: 0.6mm; Mandrel Diameter: 3.0mm Designed for Dremel Rotary Tools and Replacement 544 Lock Dremel Cut Off Wheels Package include: 10 pieces of diamond cutting wheels and 2 piece of diamond mandrel, thin and sharp, which is perfect for making slots and slits, coated on both sides as well as around the edge Wide Application: This Dremel diamond grit cutting wheel are suitable for doing DIY, cutting, sawing, carving, sharpening and filing hard materials including all kinds of precious stones, jade, marble concrete, brick, porcelain, ceramics, epoxy and other hard woods. But not recommended for metal Cutting wheel is completely coated with diamond particles The majority of rotary and air tools, including Dremel Ideal for marble, concrete, brick, porcelain, ceramics, epoxy and woods Material: Carbon steel Disc diameter: 22mm Disc thickness: 0.60mm Arbour shaft length: 36mm Arbour shaft diameter at top: 4.5mm Arbour shaft diameter at bottom: 3mm Please must wear gloves and glasses and be care around sparks when using. The cutting wheels may become very hot when cutting, add some water to keep it cool. The screw at the top of the connecting rod must be tightened when replace the cutting wheels The speed of the rotary tool could not exceed 20,000 rpm When the connecting bit is installed on the rotary Tool, it must be inserted to the end to avoid being bent or broken