Description This is a set of multi-functional sliding window safety lock. To prevent sudden closure of doors and windows or children's movement. Lock can be set to a normal state, if not necessary, can be set to a normal closed state. Insurance buckle design to protect home safety. Features - Color:Silver. - Material: Stainless steel. - Size: 30.00X0.30X0.30cm/11.79X0.12X0.12inch. - Perfect for patio doors, sliding glass doors, sliding windows, etc. - Effectively reduce the risk of kids, old and pets falling from heights, guard against robbery or theft. - Ensure family members are safe, and improve indoor air circulation. Also perfect choice for rest homes, shopping malls, hospitals, schools, offices and homes, etc. - Easy to install by simply tightening the dedicated screws on the location where you want to lock the sash window. - Heavy-duty construction ensures durable and rustproof, reusable and reliable.Package list: 2 x Chain Locks