5 3/4" CBN Super Abrasive Grinding Wheel Disc for Chainsaw Rakers Sharpening OEM UPGRADE - This is a High Performance Aftermarket Replacement Part - This is NOT an OEM Part This wheel will perfectly grind chainsaws made of steel (hss) For tooth pitch: chainsaw raker wheel, to grind rakers Outside diameter: 5 3/4" or 146,05mm, Bore diameter: 7/8" or 22,23mm, Free reducing bushing/spacer included to fit 12 mm shafts. To use with grinding machines: Oregon 511/510, Stihl, Timbertuff/Upright, Maxx/Pro-750, Efco, Tecom