Ring-shaped lifting expansion eye bolts in the package. These heavy-duty expansion eye rings are made of stainless steel, waterproof, wear-resistant, corrosion-resistant, never rusty and . Easy to install. The expansion bolts is formed by tightening the bolt, which pulls out the conical cone to make the sleeve close to the hole wall. Select an impact drill bit with the same diameter as the expansion tube of the expansion screw, and then install it on the electric drill to drill holes in the wall. The depth of the hole is the same as the length of the bolt. Application: This heavy-duty torque control shield anchor Hardware Tools for Wall Building is suitable for concrete masonry and solid brickwork,ceiling,expansion sleeve anchor bolt heavy duty fixing anchors suitable for fences, anti-theft, doors and , rain sheds, air-conditioning fixed, home decoration, engineering, etc. Note: Expansion bolts must be installed on a relatively hard base plate, and the soft and easy to fall off places