Designed with threaded bolts, the screw head is evenly stressed and has reliable thread connection and fixing capabilities. It can be firmly fixed to concrete, block, brick and stone, walls, or any solid . Made of carbon steel, treated with an electroplating process for enhanced resistance, high hardness, and long-term durability. The package comes with 100pcs of silver carbon steel in nut size 1/4inch x 5/8inch, thread size: 5.5 x 19mm/0.22 x 0.75inch(D*L), casing length: 5.1mm/0.2inch, total length: 24.5mm /0.96inch, nut size: 9.7 x 4.4mm/0.38 x 0.17inch(Across Flats D*T), pre-drilled hole diameter: 10.5mm/0.41inch, installation torque: 5Ft/Lbs. The bolt is suitable for various situations such as construction, home decoration, and mechanical equipment, widely used in guardrails, anti-theft doors, awnings, air conditioning propeller fixing, home decoration, engineering, etc. Drill holes in the wall, use hex nut sleeve anchors, insert the anchors into the pre-drilled holes, secure the nuts and install the bolts to complete the connection., Manufacturer: PokFhgur