pactrade marine flip-up retrackable dinghy wheels pair nylon inflatable boat launching wheels/boat dolly pactrade marine pactrade marine flip-up dinghy wheels inflatable boat launching wheels / boat dolly design for small, portable boat. this dolly wheel kit easily attached to almost any small boat to allow for effortless movement of your boat over pavement, beach, or other surface. eliminate the risk of damaging your boat by dragging it. it does consist 3 positions wheel locking function. wheels easily lock up when not in use and easily fold down for boat moving. easily installed on wood, fibreglass, or aluminium transoms. free from corroding and rusting including sunlight and salt-water. wheels are maintenance free and self lubricating. installation: simply attach two brackets to transom of your boat. specifications: fixing plate 5 7/8" x 3 7/8"; height 103/4"; wheel diameter 5 1/2"; mounting hole diameter 1/4"; suitable for boats up to 12' / 440 lbs. item number: pm180001. made in taiwan. sold in pairs