This lock that you see is installed on ready-made glass doors, which means that there is no need to change the glass or make any cuts in the glass. Installation is simple and takes very little time. Made of stainless steel (#304). This model is one-sided, designed to be locked only from the outside or vice versa from the inside. It has very compact dimensions, if you want to lock the door without bending, this lock may be the right choice for you.