Milwaukee 4" (100 mm) × 9/32" (7 mm) high-carbon-steel jig saw blades, universal (U) shank, 6 TPI for fast rough cuts in softwood. Pack of 5 blades. HCS is the economical choice for high-volume rough cutting; step up to bi-metal (48-42-5xxx series) for extended service in nail-embedded or hardwood. Milwaukee P/N 48-42-0500.