Prefabricated to meet NFHS specifications. Designed facilitate easy set up and convenient concrete pour. Structure is made specially folded 18' aluminum to maximize integrity and rigidity. This form is designed to receive the Aluminum Sand Pit Cover System . The sand trap basin allows sand to be conveniently stored when the pit is covered and quickly returned to the pit for competition. Athletes can stomp their shoes out over the grates to rid themselves of sand. Inside Dimensions 23' 7 38' x 9'9'. Please Note This item CANNOT ship to P.O. Boxes, APO, or FPO Addresses. It CAN ONLY ship to a Street Address.