ALEKO 4NGRACK33 Nylon Gear Racks for Sliding Gate Opener Operator Set of 4 3.3 Foot Racks Total 13 Feet Our nylon gear racks are compatible with any ALEKO brand AR series rack driven gate openers Made for ALEKO brand gate openers, but compatible with most other rack driven openers Made of fiberglass reinforced nylon surrounding a steel tube Nylon gear racks are operate more quietly than steel racks, and are rustproof Includes (4) 3.3 foot long gear racks for a total of 13 feet, and all needed fixings