A great and safe alternative for drilling and fastening the door leaf! The holder of this chain is quickly and easily next to the door frame (frame) mounted in the masonry; then simply attaches the chain on the door handle and click it in the bracket - done. It is not damaged and it secures his apartment door effectively! On top of the usual good Abus Quality! When you leave the apartment, you can take out the chain from the outside and has an additional safety the front door. Therefore: Absolute buy recommendation! Amazon was as always top!