Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Cratex MX Mounted Wheels - Extra Fine Grit by Grobet Sale $12.05 | / SKU 10-9864 1 2 3 4 5 6 7 8 9 10+ Quantity Chevron down icon Quantity Add to cart Spinner icon Notify me when back in stock Email address Email me when available Cratex MX Mounted Wheels - Extra Fine Grit Mounted on 1/8" (3.2mm) shank. Safe speeds: 3/8" (10mm) diameter - 17,620 rpm, 1/2" (13mm) diameter - 12,750 rpm. Size is 3/8" x 3/4". Grit 320 (extra fine).