Use these to secure cargo in your trunk. The first top piece is designed to have bungee cords hooked thru it if need be, and the rev 2 top will be better to accept cordage.Adhere the hook part of 2 inch hook and loop tape to the recess of the CargoBlockBtm print and then glue the bottom to the shelf of the top piece, either Part2^CargoBlockTop or Part2^CargoBlockTopRev2 (sorry about the awful names) hook tape side out. Your trunk will need to be upholstered for these to work, if yours is less fuzzy you may need to shave or sand down the recess.