"The Edge of Dock Leveler from Discount Ramps is the perfect solution for bridging the gap between dock and trailer! This innovative dock leveler can be installed right on the edge of your dock for convenient use. No garage door modification is needed! The dock levelers have a simple and quick operation. Lift the self-stored handle on the side of the leveler and pull it to the floor of the dock to raise the lip. Lifting the handle back up again will lower the lip onto the loading surface. Once the lip is in place the handle self-stores on the side of the dock leveler, and the lip returns to the stored position once the trailer leaves. The optimum dock height for conventional trailers is 51"". Included with the dock levelers are a set of bumper blocks to protect the back of a trailer and the dock leveler itself. Steel faced bumper blocks are also available (sold separately)."