[Application] Single hole stopper lock sliding window locks can be used for patio doors, sliding glass doors, horizontal sliding windows, vertical sliding windows and sliding doors. [Material] Made of metal and plastic, it is durable and can provide long-lasting and stable performance. [Function] It can keep the window partially open and partially closed, promote air circulation, and also prevent items from falling due to accidentally opening the window. [Easy to install] No drilling or other installation tools required, easy to install and remove.Place the window lock on the window and turn the Allen key. [Size] The diameter of the two hole stopper is approx. 29 x 23.5 x 22.5 mm. Before purchasing this sliding window lock, please make sure the heigh.