This is a A-B1AC10124 Sharpening Stone, Blade PN: B1AC10124Main Description As Following : A-B1AC10124 Sharpening Stone, Blade P.N: B1AC10124 Center Hole: 7/8"Diameter: 12"Grit: 30Material: CeramicWidth: 1" Crossed From: RBG10124 WALL SAFETY PRODUCTS , 7016 ROTARY Found in Section & Models : Sunbelt - Blades > Blade Tools & Accessories, (Miscellaneous) GRINDER, BLADE: SEVERAL, Sunbelt - Equipment > Grinders, (Miscellaneous) GRINDER, BLADE: SEVERAL Associated Items : New Also This is An Aftermarket Product And : Center Hole: 7/8" Diameter: 12" Grit: 30 Material: Ceramic