SEGMENT TYPE - 3" grinding discs with 10 segments per disc GRIT SIZE - #30/40 Grit MEDIUM BOND - best for medium soft to medium hardness concrete COMPATIBLE - fits polar magnetic quick change configurations, 3 hole bolt-on and STI pin WET OR DRY - floor grinder recommended 3" grinding discs with 10 segments per disc designed for floor grinders. Fits polar magnetic quick change configurations, 3 hole bolt-on and STI pin. #30/40 grit, medium bond.