Urrea® striking wrench, measurement system: imperial, 1-3/8 in wrench opening, 12 points, 12 in OAL, 1-3/16 in offset, 2-3/16 in box end W, 1 in box end thickness, head box end, offset handle, forged alloy steel, black oxide. Urrea® 2622SW Striking Wrench, 1-3/8 in, 12 Points, 12 in OAL, Box End Head, 1 in thick Box End, Black Oxide