The Boat Cradle Guidepost slides over the guidepost stanchion on a boat cradle. A 1/4 in. hole is drilled into the cap. Made from PVC. Cap comes installed on the pipe. The drilled hole allows water to drain through the guidepost when lifting or lowering your boat cradle. Measures 2 3/8 in. OD (2 in. ID). Schedule 40 pipe. You can add an option guidepost bumper for higher visibility of the boat cradle. 80".