This Camel brand 220 Grit Grinding Wheel offers you a true premium quality green grit that's designed expressly for lapidary work. Its unique bond is the perfect blend for fast, cool cutting and long life. The wheel is 6" in diameter, 1" thick, bonded throughout with 220 grit, and fits a 1/2" or 5/8" arbor. Use it to replace worn out wheels on the JB Pro Grinder and Rock Rascal Model TM Combination Lapidary Machine.