Push to open: the built-in spring loaded pusher, you can use the soft close pad to lock or unlock by just pushing the door. No handles or knobs are required. Create a clear and transparent appearance without buttons. Suitable for hinges without self-closing function. Long-term maintenance of magnetic force: The built-in magnet can extend the stroke, and the magnetic force ensures a secure closing point, which makes the door easier to weld and no longer floats the door . Make this push bolt more suitable for medium size doors. Piston, strong spring: The larger and thicker heavy-duty spring mechanism has enough tension to make this bottle opener an extremely durable and timeless choice. Make sure the service life is up to 20,000 times. Easy to install: You can install ultra-thin firing pins without drilling holes in the screw holes with the adhesive provided. It is also equipped with impact screws. Secure two screws in the bottom bracket. The tip of the magnet can be adjusted to 3mm, so you don't have to worry about the difficulty of positioning the bracket. You will get: 20 magnetic door lifters; 40 foundation mounting screws; 20 flat head screws; 20 anchor points; 20 ultra-thin adhesive knives (hot tip: for exterior doors, must be installed during installation. 3 mm compression stroke is retained.) Quantity delivered: 20 sets of money.