[Strong metal material]: The buckle lock with key is made of zinc alloy and iron, thickened and reinforced base, durable anti-theft lock core, surface electroplating process, smooth without burrs, rust, corrosion resistance. corrosion, product Guaranteed quality and long service life [Built-in lock cylinder buckle]: Equipped with automatic button hidden lock, it only needs to be rotated 90 degrees to lock, no additional lock is needed, and the button can be locked directly without inserting a key, which is very convenient. The edges of the padlock are very smooth and will not scratch your hands [Hidden screw design]: When using a key lock, its working method is similar to a conventional buckle lock. When the buckle is closed, it is in the locked position. The buckle can hide the 4 screws at the bottom, which can effectively prevent disassembly or theft, Security can be improved [Easy to install and use]: First determine the position of installation, then fix the screws at the screw