The set includes: 4 pieces door lock with 16 pieces fixing screws.Material: high quality aluminum alloy material, thick base, anti-rust and anti-breakage, safe and reliable.Size: the total size of the auto door lock is about 57mm x 43.7mm, color is black; the screw size is 16 x 4 mm. Features: simple installation, select the installation location, drill holes and tighten the screws to complete; Built-in automatic spring, stretchable and smoothly, just pull it out, loosen it and automatically rebound without hurting your hands. Wide range of uses: widely used in various doors and windows, tool boxes, storage cabinets, etc., to improve your security.Door Latch 4 Pieces Door Latch Automatic Gate Lock Exterior Door Lock Window Latch Spring Latch Bolt Black Aluminum Door Latch With ScrewsProduct Specifications:Material: aluminum alloyAutomatic door lock: latch total size is about 57 x 43.7mmScrew: 16x 4mmColor: blackQuantity: 4 piecesProduct Features:Installation is simple, select the installation location, drill holes and tighten the screws to complete.Built-in automatic spring , stretches smoothly and does not hurt your hands.Thickened base, sturdy and durable, resistance to rust and embrittlement.Package content:4 * door lock16 * screws