Sliding gates are often powered by a gate opener chain, which is a roller chain that sits on top of a sprocket on an idler and is strong enough to pull the weight of the gate. The size and material of the chain can vary depending on the specifications of your gate and the model of your gate opener. Chains are typically sold in 10-foot boxes and are connected via master links. If you need to adjust the length of the chain, you will need to purchase a chain breaker that can separate the fused links. It's important to choose a high-quality chain that is strong enough to handle the weight of your gate and the strain of frequent use. Regular maintenance, such as lubrication and tension adjustment, can also help to prolong the life of your gate opener chain.