Stainless Steel FrameNon-slip Silicone PadsThese 4 pieces safety window locks have sturdy construction,made of high quality thickened stainless steel and strengthened screw rod which are strong,solid and sturdy.Brushed stainless steel plated body effectively prevents rust to increase of service life.Most especially,our locks are designed with 2 non-slip silicone pads to increase the friction,not only prevent windows from being moved easily,but also keep the locks from scratching your windows Adjustable Length to fit Most Windows and Doors4 pieces sliding window locks with keys at the size of68*31*36mm,bigger than other brand flimsy locks.Due the adjustable design,our metal sliding door and window stopper can be used with a wide variety of horizontal or vertical windows and sliding glass doors.Apply to any windows and doors track heights more than 0.48 inches,track thickness no more than 0.63 inches,please check your window or door tracks before buying Easy Installation without Tools RequiredNo tools or drilling needed Each lock is equipped with a key,just adjust the width of lock plate,place it on the upper or lower track of any sliding window or door,rotate the key to secure it and youre done making your sliding doors and windows safe for children,toddlers and pets while improving air circulation in your home without worry.Warm tips:use two lock on heavy-duty windows/doors for added security and keep it in place by key control Protect Your FamilyThese slider locks are must-have for any parent that wants to easily prevent your curious little kids from opening the sliding windows or doors to gain access to unsafe area to avoid falling accidents when theyre out of sight They also can be used to prevent burglars and thieves from opening the windows from outside to create an environment that is safe for you and your family Perfect for home,office,school,nursery and any other place you want to make safer for children Wide UsageOur glass security doorwindow stopper can be used with most horizontal or vertical windows and doors to keep them partially open and closed without having to make any major change Whether you want to keep your doors and windows firmly closed or keep them slightly opened for air circulation,you can count on our security door stops to make sure they stay firmly in place.Perfect for patio doors,sliding glass doors, sliding windows,retractable screen doors,or sliding storm windows etc. Package included4pcs*Sliding Window Locks