Squids 3178 Locking Aerial Bucket Hook with Tethering Point, Fits 3" Lip, Attach Tool Bags or Aprons to Buckets. INTERIOR HOOK - For hanging aprons, tool boards or other gear inside bucket. SELF-LOCKING HOOK - Outer hook automatically locks when weight is applied to prevent unintentional opening (when released, gate pushes gear upward for easy removal).