With the Plug-N-Lok Padlockable Security Plugs, you can rest assured that the contents of your drum are secure. These are not to be used when shipping filled drums, just for storing and preserving your materials. You replace the 2" and 3/4" plugs for steel and plastic drums with the Plug-N-Lok, then use the keyed padlock to lock the wing nut in place. Presto. Your expensive contents are safe and secure.