Dimex ProLock™ 1100 1/2" x 100' Chain Lock Tree Tie - Made of durable, high-density polyethylene, ProLock is stronger than competitive chain lock products. ProLock simply pulls through itself and twists into a locking position. It’s also treated with UV inhibitors to prevent cracking or breaking down due to sun exposure. The carton offers efficient dispensing of the length needed, saving time and materials.