1?��ZINC ALLOY MATERIAL: Sliding window locks are made of zinc alloy material, the lock body is imitation steel color, corrosion and aging resistance, non toxic, long service life, will not cause harm to your window. 2?��APPLICABLE: Window stoppers are suitable for plastic window screen tracks and aluminum window screen tracks, they do not prevent the window sash from moving left and right, but only work on the screen tracks. 3?��CHILDPROOF: Window security stoppers lock the limits of sliding window, so your children can stay safely inside. Childproof window opening, anti child fall, screen window limit. 4?��SAFE FOR YOU: Security window lock is used on aluminum window by attaching the spacer to the moving stopper. The lock body angular blunt treatment, will not scratch the hand. 5?��AVOID PROPERTY DAMAGE: Sliding window safety locks can preserve your property from damage during heavy rains, or prevent theft and property loss during your travels.