4 in. 32 TPI Reciprocating Saw Blades (6-Pack) Ingersoll Rand Air Reciprocating Saw Blades feature Bi-Metal technology and solid-state diffusion process applies high-speed steel to both edges of the backing material, increasing the contact area by 170% New saw tooth profile, reduces the frictional heat generated during the cutting process resulting in enhanced overall cutting performance Pair with your Ingersoll Rand Edge Series 429G Air Saw . (6) 4 in. 32 TPI Reciprocating Saw Blades - P4FS P4FS-6