C.E. Smith Boat Trailer Guide-On with Unlighted Posts - These Post Guide-Ons allow you to see the location of your trailer when it's under water. The 2in PVC tubes make it easy to see your trailer's position when backing down the ramp. Mounting hardware included. Sold in pairs. Adjusts out to 13in each Side Fits Frames up to 3in W x 4-1/4in H 18in high 2in schedule 40 white PVC posts (2-3/8in actual OD). Stands 40in above the trailer frame with white post caps.