Grinding Wheel Abrasive Depth 1/8 in Abrasive Material Diamond Back Thickness 3/8 in Concentration 75 Connector Size 1 1/4 in Connector Type Unthreaded Hole Grit 120 Compatible Tool Type Tool and Cutter Grinder Primary Material Applicationn Ceramic Composite Glass Natural Stone Plastic Overall Diameter 3 3/4 in Overall Thickness 1 1/2 in Rim Thickness Not Applicable Series B99 Specification ASD120-R75B99-1/8 Wheel Type Type 11 Maximum Operating Speed 9 075 RPM