IRWIN Tools VISE-GRIP Pipe Wrench, Cast Iron, 1-1/2-Inch Jaw, 10-Inch Length (274101) Heavy-duty drop-forged cast iron housing is heat-treated to resist distortion or breakage. Hardened teeth provide tremendous bit. Easy-spin adjusting nut is heat-treated for durability. The I-beam handle's wide design provides excellent weight distribution. Unique "hammer head" design provides a flat surface for hammering.