Locks the outboard motor in the forward position while trailering, greatly reducing the damaging 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