Bosch RM418 5-Piece 4 In. 18 TPI Metal Reciprocating Saw Blades Ideal for ferrous and non-ferrous metals Metal blades are color-coded light blue for easy identification Pair-setting tooth geometry optimized for fast cuts and long life in metal 3 degree tilt angle for faster cuts, longer life and overall improved performance TPI: 18 Overall Length: 4" Application: Metal cutting