Cutting Wheel Size: 1-1/4 inch (32mm) in diameter, mandrel diameter: 3mm (about 1/8 inch), compatible with most mainstream rotary tools of name . Material: Made of reinforced fiberglass, these cutting wheels are reinforced double-sided strengthening process, and wear-, and would not easily chip or shatter. Versatile Use: As an ideal part of rotary tool accessories, these cut-off wheels work great in cutting, grinding or slotting metals like screw, bolts, welds, sheets, etc. Suitable for cutting metal, gems, glass, porcelain, ceramic tiles and other materials such as plastic and wood, great for DIY crafts and light-duty home improvement. Warm Tips: As the rotary tool cut off wheels may break under a extreme pressure, for your safety, be sure to wear gloves and the such as goggles when using. Color: As Shown Material: Glassfiber Package Contents: 60pcs * rotary tool cut off wheels 8pcs * mandrels 1pcs * screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.