Jaybro's RMS Type F Double Gully Grate and Frame is designed and manufactured as per RMS drawing R0220-26. TheRMS double gully grate and frame is tested in a NATA certified facility to AS1554.1 welding spec and AS4680 galvanising. With a bolt locking closure this square grate is bicycle safe. The galvanised mild steel grate measures 742 mm x 742 mm overall with an interior grate size of 644 mm x 642 mm.