Here at ECA we stock a wide range of reciprocation saw blades, from wood to metal, or both in one. Recip blades are used to produce a fast cut is materials, with a forward and backwards motion produced by the tool. The TPI (teeth per inch) indicates what type of finish the blade will leave, and what material it can cut. A low TPI leaves a rougher finish, mainly used for ripping out and quick cuts. A high TPI produces a clean and fine finish in the material, mainly used for cutting metal or for applications where a neat finish is required.