Locks the outboard motor in forward positon while trailering, greatly reducing the effects of road shock Does not "tie" engine's lower-unit to trailer, eliminating excessive pressure on hydraulic seals and unsightly scuff marks Small compact mount can be easily stored in just about any boat compartment Constructed of black powder-coated steel with stainless steel pins. Fits: Mercury engines 135 Optimax, 150 Optimax, 175 Optimax, 75HP-200HP EFI