Lock Type:Sliding Window LocksFunction:protect the security in their households while recovering air circulationIt is strong, stable and sturdy, beautiful workmanship,that could be reused many times.Adjust the screw through the use of the hexangular key to slot the frame thickness.Fit for music heights greater than 15mm/ 0.59 inch,track thickness no greater than 16mm/ 0.63 inch.Wide usage: Can be easily applied to most environments; By conserving the home windows partially open and closed, the burglar-proof and thieves can stop teenagers from falling and preserve the security in their families whereas recuperating air circulation.Weight: 148g/setcolour:Yellow + silverMaterial:Aluminum + plasticsize:Key length: 47mm/1.85inchWindow lock size: 30mm x 24mm x 24mm/1.18in x 0.94in x 0.94inPackage Contents:4 x Sliding Window Locks4 x KeysOnly the above equipment content, different merchandise are usually not included.Note: Light taking pictures and diversified displays may cause the color of the object within the picture a little bit varied from the real thing. The measurement allowed error is +/- 1-3cm.