Ice Hardened blades are cryogenically treated to minimize soft metal (austenite) and create more hard metal (martensite). 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.Milwaukee 48-01-9784 Features: Ice Hardened™ for up to 50% longer life. The result is a metal cutting blade that is more consistently hard throughout, for up to 50% longer life than standard blades. 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 Super Sawzall Blade Specifications: Blade Dimension: 6 x 1 x 0.042 Inch Shank: 1/2 In. Universal TPI/Grit: 18 TPI