The Locknut Wrench has been designed to end frustration! This perfect tool for locknut operation fits the majority of UL locknuts and features a thin profile that makes those normally tight spaces a thing of the past. It can be used to loosen or tighten a locknut by rotating the wrench in the direction of the arrows marked on both ends. The GB Locknut Wrench is the perfect reliable and durable addition to any tool box.