This double adjustable four finger clamp has strong alloy die cast jaws. Double adjustable- one screw moves one jaw and the other screw moves the other two jaws. The die cast swivel clamp holder accepts rods up to 0.7in. (18mm). Maximum jaw opening is 4.75in. (120mm). Jaw length is 3.0in. (75mm). With a total length of 7.75in. (195mm).