Used by D-I-Y'ers, hobbyist, carpenters, cabinet makers, woodworkers, metalworkers and professional trades people of all types; it's sliding head design is threaded to accommodate the screw with large easy grip handle and swivel pad; all adjustments are made in the movable sliding head, making this style fast acting, easy to open and close, suitable for close quarters clamping; one can easily move the sliding head up and down the bar; the 3/8" steel screw with easy grip plastic handle and 3/4" diameter plated steel swivel can be tightened or loosened to meet the exact pressure needed; has a 2-1/2" reach and a 600 lb load limit; rust resistant; the multiple-disc-clutch design consist of two hardened plated steel clutch disc and one spring which allows the sliding head to hold securely at any point along the bar; the iron castings have an orange baked enamel finish. Made in USA with global parts.