The 376 from PanaVise is a Self-Centering, Extra Wide Opening Head that is compatible with all 300 series bases. The ribbed, neoprene jaw pads are 1.875" high x 1.5" wide and provide a sure grip that reverses the pads, and the wide "V" holds round or elliptical objects. The 376 self-centering, extra-wide opening jaws open a full 9" and hold heavy objects by centering weight over the base. The "Double action" jaws open/close quickly. Jaws can be reversed to provide 0" closure. In 376 the black oxide coating reduces glare and promotes eye comfort.