Milwaukee 48-00-4713 9" 10 TPI Ice Hardened The Torch Sawzall Blades, (5 Pack) Ice Hardened blades are cryogenically treated to minimize soft metal (austenite) and create more hard metal (martensite). The result is a metal cutting blade that is more consistently hard throughout, for up to 50% longer life than standard blades. Milwaukee 48-00-4713 9" 10 TPI Ice Hardened The Torch Sawzall Blades, (5 Pack) Features: Ice Hardened for up to 50% longer life. A unique combination of relief angles forms a radius on the back of the tooth that reduces stress build-up during cutting and substantially extends blade life. Precision forming process creates sharper teeth for fast cutting. A thicker, more rigid blade body resists fracturing and bending for maximum durability. The 1" tall blade body reduces blade twisting for straighter, more accurate cuts. Matrix II bi-metal teeth for greater durability. Milwaukee 48-00-4713 9" 10 TPI Ice Hardened The Torch Sawzall Blades, (5 Pack) Specifications: Blade Dimension - 9"x1"x.042" Shank - 1/2 in. Universal TPI/Grit - 10 TPI Package Quantity - 5 Milwaukee 48-00-4713 9" 10 TPI Ice Hardened The Torch Sawzall Blades, (5 Pack) includes: (5) 9" 10 TPI Ice Hardened The Torch Sawzall Blades