These do not come with screws anymore. They do have adhesive though if you choose to go that route.

The SimpliSafe LContact Sensor 2x Pack Lot is a set of two new, sealed, and unopened wireless door sensors. These sensors, from the trusted brand SimpliSafe, are designed to provide reliable surveillance for your home. Easy to install and requiring no screws, these sensors offer a convenient and hassle-free way to enhance your home security system.