Industry standard couplers are interchangeable with leading manufacturer's units. Single-speed hydraulic hand pump and ram with 4 in. stroke. Snap together design of extension tubes allows for easy assembly. Sturdy extension tubes hold up in even the toughest situations. Automatic overload system on pump protects against damage to equipment. 1/2-ton hydraulic spreader tool has 2 in jaws that spread from 5/8 in. to 3-3/8 in. Includes a sturdy plastic case.