Hex nut expansion bolts are suitable for securing concrete, brick, doors, windows, awnings, fences, ceilings and more, which are widely used in construction projects and home repairs, such as securing air conditioners, awnings, security doors, billboards, and guardrails.SpecificationColor: Silver ToneMaterial: 201 Stainless SteelSize: M6 x 50mmSleeve Outer Diameter: 8mm / 0.31 inchSleeve Length: 35mm / 1.35 inchPackage List: 8 Pcs x Expansion BoltsAdvantage:Made of 201 stainless steel, these expansion sleeve bolts are sturdy, wear-resistant, rust-resistant, corrosion-resistant and durable, making them suitable for indoor and outdoor use, even in humid environments.Instruction: Supplied with nuts and washers for easy installation; to install, simply drill holes in the surface, insert expansion bolts, and tighten the nuts with a wrench for a secure fit.NOTE: Before use, please ensure the hole size matches the bolt diameter. Avoid over-tightening to prevent wear or deformation to the bolt or surface.