Metal Cutting Reciprocating Saw Blade, 6 in L x 3/4 in W x 0.035 in Thick, 18 TPI, 25 EA/PKPower Blast Technology is a high speed blasting along the cutting edge that strengthens the blade to reduce breaks and increase durability Patented T2 Technology reduces cutting forces on each tooth and optimizes chip removal to allow efficient cutting in the widest range of materials Patented metal cutting TPIs provide faster and more efficient cutting in the widest widest variety of materials, including Unistrut, angle iron, black pipe, and more