SPEEDJAW 3 in Handscrew Clamp Roof Flashing the easiest to install and 314846561 the easiest to install and best looking retro fit storm collar replacement professional look EXCEPTIONAL CLAMPING FORCE Holds wood and synthetic material projects firmly in place with up to 300 pounds of clamping force IRON AND STEEL CONSTRUCTION Constructed with a resilient ductile cast iron body with a plastisol padded locking handle SWIVELLING CLAMP PAD Fully adjustable pad base allows height and angle changes for better grip on odd shaped projects 3 4 INCH SHAFT 3 4 inch diameter threaded shaft allows for up to 3 inches of height adjustment DUCTILE IRON PAD Includes a removable ductile iron clamp pad that provides more surface area and better grip on metal projects REMOVABLE BASE Base and shaft are removable