The DEWALT DW4804 12-inch 6 TPI taper-back bi-metal reciprocating blade is a general purpose blade built for fast cutting in wood. This taper-back blade can also be used to cut a wide variety of materials, including metal, plastic and drywall. In general, a lower tooth count cuts faster, but provides a rougher finish, and this 6 TPI (teeth per inch) blade is no different. Each DW4804 features bi-metal construction with reinforced teeth for increased durability, anti-stick coating for reduced friction, and Matrix II steel with 8-percent cobalt for longer blade life. In addition, this reciprocating blade features a +/- 6-degree shank angle for aggressive cuts, and a raker tooth design for increased tooth contact area. Built from the toughest materials, the blade body is durable, yet flexible to reduce breaking. This all-purpose blade will fit all brands of reciprocating saws.