High Leverage Allows One-Hand Operation. Exceptionally strong, rigid frame, weighs only 6 lbs. Works with nearly all valve-in head and L-head engines as well as truck and tractor engines. 44770- Set of Offset Jaws *Spring-11 1/2" *9 3/8" *Throat Depth is 9-3/4" *Jaw opening is 10-3/4"