Flat type buffing wheel(Small grinding wheel) size: ID 22.23 + 0.5 mm, OD: 125 + 2 mm, Thickness 6.6 +/- 0.5 mm, Max. velocity 80 m/s. suitable for grinder shaft grit - 80 of make M/s. Bosch PART NO: 2608603227 OR its equivalent in Grindwell Norton