Designed for single sliding or bi-parting metal or wood doors. Intended to take abuse from trucks, tractors and farm machinery when used around factory and farm buildings. Smooth ramp on each side of the guide prevents cutting tractor or truck tires. Mounts on concrete floors with lag screws and shields or on a 6 in x 6 in post. 1/2 in rod or bolt inserted through hole in each side will serve as a center stop for bi-parting doors. Meets ANSI/BHMA, A 156.14. Manufactured from hot-rolled steel. Boxed.