12 in. 18 Teeth per in. TORCH Thick Metal Cutting SAWZALL Reciprocating Saw Blades (100 Pack)The 12 in. x 18 TPI The Torch metal-cutting blades with the Double Duty Upgrade feature a tooth form optimized for the longest life and maximum durability. Tough Neck is engineered to protect against tang breakage and delivers the strongest SAWZALL blade tang on the market. Grid Iron features a stamped honeycomb pattern throughout the body of the blade that greatly increases the rigidity of the blade, making it the stiffest metal cutting SAWZALL blade on the market. These blades are ideal for making tough, straight cuts. The 48-00-8789-100X contains 100 blades.