Bosch T118E 5-Piece 3-5/8 In. 14-18 TPI Basic for Metal T-Shank Jig Saw Blades For medium to thin metals 7/32 In. to 5/64 In. thick (ferrous and non-ferrous) 14-18 TPI progressive tooth design for smooth cuts in various thicknesses High-speed steel construction for maximum life in straight cuts 3-5/8 In. overall length, 2-5/8 In. working length Proper lubricant is recommended when cutting metal