DOUBLE SEGMENTS - diamond encrusted bar segments PREMIUM EXTRA SOFT BOND - suitable for grinding extremely hard concrete and cap cutting GRIT SIZE & SET - #18/20 grit size includes 3 grinding discs USE WET OR DRY - walkbehind grinder recommended COMPATIBLE - fits Husqvarna PG 280/400/450/530/680/680RC/820/820RC Grinders Diamond grinding tooling designed for Husqvarna PG series floor grinding machines. Set of 3. PREMIUM EXTRA SOFT BOND - ideal for grinding extremely hard concrete and cap cutting. #18/20 grit with 2 diamond segments, use wet or dry with Husqvarna floor grinders such as PG 280/400/450/530/540/680/820/830.