1. Multipurpose Use Concrete brick expansion screw bolts fastener is suitable for fixing to concrete and masonry and a variety of heavy installations, widely used in construction projects to home repairs, such as a fence, canopy, concrete anchoring, building walls, indoor bathroom and kitchenware, air conditioning, ceilings, doors, lighting, advertising billboards, TV wall mountings, outdoor guardrails, etc 2. Expansion Bolts Our durable air conditioning wall fixing screws are crafted from galvanized ironcarbon steel. These bolts are resistant to rust and corrosion, possess high hardness, are strong and not easily breakable, can securely fix heavy objects, and enjoy a long life 3. Size Package The package comes with a 20pack of M6x80mm expansion bolts anchor bolt in size M6x80mm. Screw Length: 80 mm / 3.15 in; Casing Size: 69 x 8 mm / 2.72 x 0.31 in (L x OD); Hexagonal Opposite Side: 9.79 mm / 0.39 in; Gasket Size: 6 x 15 x 1 mm / 0.24 x 0.59 x 0.04 in (ID x OD x T); Head Thickness: 4.3 mm / 0.17 in; Screw Diameter: 6 mm / 0.24 in 4. Advantage The surface of the sleeve anchor fastener wall concrete is smooth and burr. The threaded bolts are designed to evenly bear force, provide reliable connections, and firmly fix solid surfaces such as concrete and masonry. Expansion bolts come with nuts and washers for easy installation.