Height: 7 1/4", Neck Spacing: 3", Opening: 5 1/4", Tread: 2 1/8". Ralide stirrups are precision injected molded from a very tough grade of polymer that provides excellent flexural strength and durability. These stirrups are easy to cover as their uniform size and smooth edges make it easy for the Craftsman to do a superior job of applying leather. Ralide stirrups are shipped unassembled so it is not necessary to remove the neck spacers and bolts prior to covering as it is with wooden stirrups.