These kits can be installed by simply drilling a 9/16th inch hole through the trailer floor wherever a tie-down loop needs to be located. Four wood screws come with each kit to secure the plates in place under the trailer floor. Two 1/2-inch bolts X 2 inch long are supplied to mount the loops to the top of the trailer floor. Once plates are mounted there is no further work to be done under the trailer. The kits are designed for simple removal of the surface mounted loops, leaving a smooth, clear floor surface. This kit is the same as the stealth plate kit with the top loops added. Comes with two 4-inch plates with heavy 1/2-inch nuts permanently mounted, 4 wood screws, two - 2 inch long bolts, and 2 tie heavy duty tie-down loops. This is a very slick way to add a tie-down location in your trailer.