Dophee 6PCS HSS Saw Blades Metal Cutting Wheel Discs Mandrel Rotary Tool Set For Dremel Ideal for cutting hard materials like wood, plastics, laminates and aluminum, etc. Made from strong HSS high-speed-steel, durable and firm. Suitable for use in carpentry and crafts. Maximum RPM: 20,000. Hole diameter: 6.35mm (Approx. 0.25"). Mandrel diameter: 3.17mm (Approx. 0.12"). Blade Diameter: 22mm, 25mm, 32mm, 35mm, 44mm, 50mm.