M&W Insulated Swivel Hook with Latch 4000 Lb. CapacityFeatures: Manufactured to exceed all ASME B30.20 and OSHA regulations ALL Lifting Beams proof loaded and shipped with certification paperwork. Durable construction ideally suited to jobsite or warehouse use. Use provided spacers to assure hook remains centered. Made in U.S.A. ALL lifting equipment individually proof loaded per OSHA requirements. Electrically insulated - helps eliminate current flow that may damage hoists and lifting equipment.