m12 bolt upper electric gate guide rollers

...Gate Guide Rollers Upper Bolted Bracket Mount 6” Black Dual UHMW Hard Nylon Ball Bearing Guiders Heavy Duty Steel Assembly Anti Tipping for Sliding Rolling Gates Equipped to Fit any Slide Rolling Gates – Bolted Bracket Mount 4” x 4” Adjustable Hard Ball Bearing Nylon Upper Bracket – Up to 4.5” inches Over All Shaft Dimensions – 10” L x 2”W x 2”D Prevents Gate......