This is a waterproof ammo can lock system.  These are built to outlast your ammo can. 
These locks are very easy to install.  It can take as little as one minutes to install. 
Required tools:
Hand held drill
1/2" drill bit
Crescent wrench
Simply use the hole in the middle of the latch to guide the drill bit into the ammo can. (Tip, when latching the lid down to drill the hole, make sure to center the latch).  Drill hole into the ammo can.  Unlatch lid and instal the lock.
Locks are not included.  Home Depot is a great place to purchase the locks for these.
Hello.  Thank you for looking at my listings.  I am a pilot and do my best to respond to questions quickly and ship orders in a timely manner.   There are times when I am away from my shop for a few days and am unable to respond to emails or ship orders.  I usually ship six days a week but sometimes it will only be once a week if I am away on a flight.  Thank you for understanding.