Hard bond for extremely long life. fast, burr-free cutting. Ferrous and/or non-ferrous metals (iron, steel, welds, etc.) Manufactured with patented 3M Cubitron grain to outlast standard aluminum oxide wheels Thin cutting wheel in a Type 27 shape makes this perfect for your angle grinder Unique bonding sysem lets yuou make faster burr-free cuts Designed to provide very long life for fewer wheel changes and less downtime