Better designThe door bolt locks inner ring is equipped with a spring, and the circular pull ring is used, which is convenient to switch; the base is thickened, and the handle is integrally cast with high stability, locks provide enhanced security for doors and windows. . High-quality MaterialThe spring door bolts is made of solid aluminum alloy, which is anti rust and anti corrosion, Thickened solid bolt, Sealed welding, thick reinforced base for durability and wear. . Easy to InstallDrill holes with a drilling machine or an electric screwdriver before installation, then fix the spring loaded bolt with screws (included), easy to install, labor-saving work, teenagers or the elderly also can easily handle it alone. . Package IncludesThere are 2 barrel bolt lock small and 8 screws in this package,Keep those pesty intruders away with this high quality door latch, even if you are away from home for a long time, you dont have to worry about the safety of your home.