The diamond grit bonded to the edge of these steel blades lasts up to 30 times longer and cuts through abrasive materials twice as fast as blades with carbide grit. Also known as demolition blades, these are wide to cut through multiple layers. Blades have a 1/2" universal shank that fits most reciprocating saws. These bimetal blades have a flexible carbon steel body with high-speed steel teeth.