Includes 2 rollers and a post (bolt on) for a any width gate frame. Simply bolt the bracket onto a post adjacent to your gate the other bracket to the provided post after it is sunk in cement after positioning. The rollers will hug the gate frame and keep the gate from tipping over. The bracket is made from steel and the rollers are made of rubberized UV protected hard plastic. Designed to stand up to the rigors of even the most extreme climates - these rollers will last for years and are maintenance free due to the internal sealed ball bearings.
3" tall would be for gates with a flat top, 12" tall would be for gates that have an arch top (12" difference from trough to crest max) so the top frame will be on the roller at all times.
QB ID: GR-12 POST