Specification Brand : Culnflun BulletPoint1 : [EFFICIENT DRILLING PROCESS] The depth of drilling must be 7cm or more and use a 16mm drill bit to create holes for easy insertion of the bolt into concrete walls. BulletPoint2 : [STRONG] Made from metal, this expansion bolt has a length of 11cm and a diameter of 16mm, providing a secure hold for heavy loads up to 250kg. BulletPoint3 : [VERSATILE USAGE] Suitable for cement and concrete materials, this anchor fastener eye bolt is ideal for various mounting applications. BulletPoint4 : [FIXATION] The expansion screw, when tightened with a wrench, creates friction and binding force to ensure a stable and long-lasting hold. BulletPoint5 : [EASY INSTALLATION] With clear instructions, simply insert the expansion bolt into the pre-drilled hole, twist the wrench, and secure it in place for safe use. ItemName : Culnflun Expansion Bolts, Heavy Duty Anchor Fastener Eye Bolts with 250kg Load Bearing for Concrete Wall Mounting ItemPackageDimensions_Height : 3 centimeters ItemPackageDimensions_Length : 16 centimeters ItemPackageDimensions_Width : 12 centimeters ItemTypeKeyword : screw-eyes Manufacturer : Culnflun Material : Metal ModelNumber : Culnfluna1iz4f2sow NumberOfItems : 1 PartNumber : Culnfluna1iz4f2sow ProductDescription : Item Type: Expansion Bolts Material: Metal Total Length: Approx. 11cm / 4.3in Usage: Step 1: Tighten the spanner Step 2: Turn the wrench again until the nut can not be screwed. Step 3: Insert the expansion screw into the hole of the cement concrete wall made ahead of time, and twists the wrench forcedly until it can not be moved Tip: You may need to purchase two additional connectors to connect the expansion screw to the expansion screw.