Milwaukee 48-00-5189 SAWZALL 12” 18 TPI Standard Metal Blades (5PK) Milwaukee 48-00-5189 SAWZALL® 12” 18 TPI Standard Metal Blades feature a tooth form optimized for the longest life and maximum durability. TOUGH NECK&mark; is engineered to protect against tang breakage and delivers the strongest SAWZALL® blade tang on the market. GRID IRON&mark; 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.