The W300CZP 3-inch Eye Lag Screw from Doc's Industries is designed to fasten ceiling wire or jack chain to wooden surfaces . This 3-inch Eye Lag Screw can be used in conjunction with a Lagmaster Pole Tool for efficient and secure installation of ceiling wire or jack chain from ground level. The W300C boasts an electroplated zinc finish, ensuring a clean, oil-free surface. It is advised to use this product exclusively for indoor applications. Eye lag screws enable the attachment of steel wire to the underside of horizontal wooden components, facilitating the installation of suspended ceiling systems.