Our INDOT-approved (per spec drawings), Buy America certified Grated Box End Section (GBES) set castings are completely customized castings. Specifications for pipe size and slope are required upon quotation; the GBES Type 1 grate set is built to order. The invert grade of the GBES should be the same as the pipe it is planned for. Freight shipping is required and Buy America certifications are available upon request.