The SM-98 large, locking heavy-duty model holds top mounting lug hole of tire 7" out and 6-1/2" up from top of the trailer frame or tongue at a 90-degree angle to the ground. Fits 4 or 5-hole (6-hole with 4-1/2" diameter bolt hole pattern) rims with center hub holes that are 3-1/4" diameter or bigger & (6-hole with 5-1/2" diameter bolt hole pattern) rims with center hub holes that are 4" diameter or bigger. Fits 3", 4" and 5" high frames up to 3" wide. Has a lock-tab for optional padlock. (Padlock not included) The rigid tire mount is constructed with extra support brace which fits tires up to 16". Zinc plated finish.