PlugerKeyper works by locking the ignition into the device by screwing the drain plug down on top of it. This easily reminds the operator that the plug is out when they try to start their boat. Made for the 1/2 inch garboard drain plug which is typical for most recreational boats. The bottom is designed as a socket to install and remove the drain plug. The plug, key and float are NOT included. This item only contains the plastic PlugKeyper and a small keychain. Veteran owned and operated Made in the USA