Striking Wrench, 13 3 4 in, 2 3 8 in Opening ORS NASCO Used with Jackson Safety Curv O Mark® Used with Jackson Safety Curv O Mark® tools and flats Acme rolled spindle threads provide continuous smooth operation for faster clamping action and maximum strength Spindles and Perma Pads® are copper plated to provide resistance to welding spatter and corrosion Ideal for industrial welders and steel fabrication The large smooth striking surface reduces the hazard of glancing blows and lessens the chance of a rope slipping from the handle when maintaining tension on the wrench Proper clearance in overall head diameter that is necessary when working with flange connections