Ceramic bonding grinding wheels for polishing concrete and smoothing scratch patterns, particularly around corners and edges. Ceramic bond grinding is very effective at removing scratch marks left by metal bond grinding wheels. #50 grit with 5/8"-11 arbor size. Use wet or dry with angle grinders. Specifications: CERAMIC BOND - ceramic bonding grinding wheels for polishing concrete and smoothing scratch patterns, particularly around corners and edges GRIT SIZE - #50 grit ARBOR SIZE - 5/8"-11 threaded arbor EQUIPMENT TYPE - use with angle grinders CUTTING METHOD: wet or dry