... roller bracket 2. slot for vertical adjustment. 3.size:5", 8",10",12" Galvanized Steel trailer roller Keel Mount BracketOne piece ... roller bracket with slot for vertical adjustment. Mounts with 1/2" bolt and is designed to ... be used with a 5/8" roller shaft.1.Size: 5", 8", 10", 12"2.Package: carton, metal ...