Wilton 21804 4-Feet Jaw Opening, Bar Clamp-6, 000 Load Capacity, Regular-Duty, 1 -Pack A Rapid Acting Powerful Clamp Designed And Constructed For Hard, Everyday Production Work Quick Action, No Slip Clutches Are 3/4? Apart And Formed In The Web For Greater Bar Strength High Strength Ductile Slide Cannot Slipo Or Bind: Easily Released