TM406-006 | ITM Grinding Wheel Silicone Carbide 200 x 25mm 80 Grit Fine Wheel comes complete with a “multi bore” bush. This caters for 1/2 inch (12.7mm) 5/8 inch (15.88mm) 3/4 inch (19.05mm) and 1 inch (25.4mm) shaft sizes. Universal Fit: To use the wheel push out the bushes smaller than the shaft size of your grinder.