Piece of black aluminum alloy door bolts, automatic safety window and gate lock with spring return mechanism

[DIMENSIONS] – 26 mm long; 4 mm diameter mounting hole; aluminum alloy, black painted. [APPLICATION] – For securing doors, windows, grilles, French doors, etc. [INSTALLATION] – Use a Phillips screwdriver to tighten. For harder woods, it is recommended to pre-drill a small hole before installation. Can be mounted at various angles. [NOTE] – Do not use a hammer for direct installation. Screws are not included. [ADVANTAGE] – Automatic door latch, spring-loaded, with return ring.