1、High Quality Material: Trailer jack is made of high quality galvanized steel and rubber material, high strength, rustproof, sturdy and durable. 2、Adjustable Height: Total height after shrinkage is approx. 580mm/22.83in, total height after stretching is approx. 834mm/32.83in, can lift approx. 254mm/10in. 3、Excellent Performacne: Professional manufacturing, exquisite workmanship, rated bearing capacity is 1200lbs, heavy duty trailer jack has a long service time. 4、Easy Operation: Swivel handle and long crankshaft provide comfortable hand cranking action to quickly raise and lower, convenient for using. 5、Wide Application: Adjustable trailer tongue jack is suitable for yachts, trailers and RVs, etc, and has a wide range of application.