Diamond Coated Rotary Cutting Tool Grinding Wheel Discs Set 10 Pcs Product Name : Diamond Grinding Disc;Main Material : Diamond , Metal Outside Diameter : 16mm , 18mm , 20mm , 22mm , 25mm ,30mm , 40mm;Mandrel Shank Dia. : 3mm / 1/8" Mandrel Length : 36mm/ 1 3/8";Case Size : 11 x 9 x 5cm / 0.4" x 0.35" x 0.2"(L*W*H) Color : Silver Tone;Weight : 108g Package Content : 1 x 16mm Diamond Grinding Disc 1 x 18mm Diamond Grinding Disc 2 x 20mm Diamond Grinding Disc2 x 22mm Diamond Grinding Disc2 x 25mmDiamond Grinding Disc1 x 30mm Diamond Grinding Disc1 x 40mmDiamond Grinding Disc1 x Plastic Case