Depressed Center Grinding Wheels, 3", 3 Pk, 60 Grit Manufacturer: SHARK INDUSTRY SKU: SHK12758 Manufacturer part number: 12758 UPC: 682488127587 Call for pricing Qty: Buy Now Custom wishlist OK Add to wishlist Add to compare list Email a friend Long life, reinforced Zirconia grain wheels last up to 3 times as long as an aluminum oxide wheel. 25,000 maximum RPM. Overview Attachments Reviews Long life, reinforced Zirconia grain wheels last up to 3 times as long as an aluminum oxide wheel. 25,000 maximum RPM.