Broco Diamond Rescue Saw Blades cut metal, concrete, correctional glass and ceramics. Intended for use with gasoline and battery powered saws with 1″ or 20mm diameter arbors, standard Diamond Rescue Blades come in 12″ (6300 RPM rating), 14″ (5460 RPM rating) and 16″ (4725 RPM rating). The 12″ and 14″ blades are solid core for maximum durability. The diamond electroplate facing protects the core, reduces heat and prevents binding.