2-pack of 12-inch reciprocating blades for masonry application - use to cut through brick, mortar, cinder block, aerated concrete / porous concrete, fiber cement, engineered stone, and more. High carbon steel construction with tungsten carbide teeth. Works with all major reciprocating saw brands such as DeWalt, Makita, Ridgid, Milwaukee, Porter & Cable, Skil, Ryobi, Black & Decker, Bosch, Hitachi.