This LJ/TJ Sand Pit Cover is fabricated from extruded aluminum seat plank. The ideal cosmetic cover for your LJ/TJ sand pits. Three planks per panel are securely welded together in a frame of 2-3/8" x 1-1/2" x 3/16" aluminum angle. Each panel comes with four retractable handles for easy installation and removal.A 2" wide supporting recess is required on each side wall for the panels. This recess is not required on the end walls. When not using a Gill pre-fabricated sand pit form, it is important to include a 2" "ledge" along the sides of the sand pit to accommodate the 730148 sand pit cover. The 730148 is designed to allow a track builder to apply the same surface as on the track for a seamless design. Manufacturing begins upon receipt of form 730148-2 (field check guide). A typical sand pit requires 10-11 cover panels.Sold by the square foot.