Industry standard couplers are interchangeable with leading manufacturer's units. Single-speed hydraulic hand pump and ram with 6 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. Includes: Single-Speed Hydraulic Hand Pump,1/2-Ton Hydraulic Spreader Tool,Extension Tubes,Couplers,Sturdy Plastic Case.