making certain quality and Aluminum automatic door bolt, spring loaded, pull ring bounce. EASY INSTALLATION: Including mounting screws. Suitable for home, room doors, windows, etc. good replacement,and ,sturdy can be used to augment safety for doors,gates and home windows Material: Aluminum Alloy Color: White Dimension: 58 x 44mm/2.28 x 1.73 inch(L x W) Weight: 1.485 ounces/42g Package Contents: 1 * Self Closing Latch Bolt four * Self-tapping Screws Only the above package content, other products are usually not included. Note: Light and diverse exhibits may cause the colour of the object in the photograph a bit of diverse from the genuine thing. The measurement allowed error is +/- 1-3cm.