Standard Abrasives A/O Unitized Wheel 882137, 821 3 in x 1/4 in x 3/8 inGeneral Information Brand Standard Abrasives Attachment Type Center Hole Country Of Origin United States Sold As Case Lead Time 16 days California Residents Proposition 65 Warning Dimensions and Specifications Center Hole Diameter (Imperial) 0. 375 in Center Hole Diameter (Metric) 9. 525 mm Face Width (Imperial) 0. 25 in Face Width (Metric) 6. 35 mm Maximum Speed 18000 rpm Overall Diameter (Imperial) 3 in Overall Diameter (Metric) 76. 2 mm Grit Non