The expansion screw is cleverly designed, and the outer ring of the screw is expanded by inserting a screw into a pre-drilled hole, creating a strong friction force with the bore to achieve the purpose of mounting in the bore. Application: Expansion screws are widely used in home and office equipment, fences, security doors and windows, awnings, home decoration, communication equipment, industry, furniture, home improvement inventions, building fasteners, etc. Specification: Color: Silver Material: 304 Stainless Steel Dimension: M10*80 Usage Principle: Expansion is created by tightening a threaded bolt, causing the sleeve to expand to a barb against against in the walls. Application: The Expansion screw hook bolts can be used to fix water heater, air conditioner, canopy and other heavy household items. Set: 6 x M10 Expansion Anchors Head Bolts How to install: 1. Use a drill bit to drill a hole of the same diameter as the expansion tube on the wall; 2. Install the hole-drilled fixing parts on the fixed objects with bolts; 3. Knock the expansion screw set (with the fixed object) into the hole; 4. Tighten the screw with a wrench and the conical mother expands the expansion tube. Note: 1. You need to prepare a drill bit with a diameter of 14 mm. 2. Please pay attention to the depth of the hole before installation. The depth of the hole is determined by the thickness of the item you are hanging. 3.All the above data are measured manually, please allow an error of 1-3mm.