Strong steel unit bolts or welds to vehicle's frameeasier to install than T-type stabilizers. Opens and closes easily with speed crank included. Set includes 2 stabilizers, hardware. Stabilizers sold by height (distance between frame and ground). 8"-long drive screw extension. 2,000-lb. static load per leg. Fits 61" to 74" wide frames. Order 2 sets to stabilize both front and rear. Base pads (7" diam.) for firm footing on soft ground available, sold separately (Stock # ZX890000).