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Features More holding power and works easier than ever; Works on all surfaces and most trailer axles (round or square) from 10" - 15" wheels; To use, just place the boat trailer jack under the axle and drive forward or reverse a few inches; Quick change automatically raises the trailer to the proper height for changing tires, lubricating or replacing wheel bearings and more; Specifications Dimension: 11.13" H x 3.75" W x 17.25" L; Weight: 3.57 lbs; .
