3M Silver Depressed Center Grinding Wheel, 87447, Quick Change, Type 27General Information Brand 3M Attachment Type Threaded Product Type Grinding Wheel Wheel Type T27 Country Of Origin Austria Sold As Carton California Residents Proposition 65 Warning Dimensions and Specifications Center Hole Thread Size 5 8" 11 Maximum Speed 10200 rpm Overall Diameter (Imperial) 6 in Overall Diameter (Metric) 152. 4 mm Overall Thickness (Imperial) 0. 25 in Overall Thickness (Metric) 6. 35 mm Grit Non Pertinent Micron Grade Non