The high-security door reinforcement locks help prevent doors from being knocked away, enhancing your home security and keeping you and your family safe! Make sure none of the doors can be opened from the outside. Suitable for inward opening doors. (NOTE: NOT suitable for double door, sliding door and french door)SpecificationColor: SilverMaterial: Zinc AlloyMaximum Withstand Capacity: 800 LbsMounting Plate Size: 69 x 38 x 7 mm/ 2.72 x 1.5 x 0.28 inch (L*W*Thickness)Lock Part Size: 36 x 46 x 62 mm/ 1.42 x 1.81 x 2.44 inch (L*W*H)Screw Hole Distance: 27mm/ 1.06 inch, 50mm/ 1.97 inchScrew Length: 69mm/ 2.71 inch; 44.7mm/ 1.76 inchPacking List: 2 x Door Reinforcement Lock with 6 x 69mm Long Screws and 6 x 44.7mm Short ScrewsAdvantage1.