【Long-Life Teeth】 Teeth made of bI-metal with 8% Cobalt which makes EZARC reciprocating saw blades with 2times longer life comparing with normal bi-metal blades without cobalt. 【Metal Master】 Hard cobalt edge provide effortless cutting into sheet metal, metal pipe and profile. 【Cutting Capacity】 Blades cut through medium to thick sheet metals 3-8 mm, solid pipes/profiles diameter < 175mm. 【Optimized Design】 0.9 thin wall and set teeth design helps to reduce heat build up and maximize your cutting efficiency. 【Universal shank】 1/2 inch shank fits all Sawzall tools on the market including Bosch, Dewalt, Milwaukee Sawzall Saw, SKIL, Makita, Black & Decker, Ryobi, Porter Cable, Hitachi, Flex, Hilti, Metabo and more.