By centering weight, this Vise Heads holds even larger and heavier objects with ease * Ribbed, neoprene jaw pads are 1.875 (47.6mm) high x 1.5 (38.1mm) wide and provide a sure grip; reverse the pads and the wide V holds round or elliptical objects * Compatible with all 300 series Bases * Head Length: 11.5 (292.1mm). Height (shaft to top of jaw pads): 5.25 (133.3mm), Weight: 1.9 lbs. (0.9kg) * Limited Lifetime Warranty!