The Link Lock is a sturdy latch that can withstand a serious workload. These can be installed by welding them on to a metal frame or by using 3/8" or M5 screws or bolts (not supplied).
With a twist of the wing head, this latch compresses almost 1/4", and will not open accidentally, even if there's a lot of vibration. Link Locks can be used with or without a keeper (which is why they're sold separately).
This version of the Link Lock is "Spring Loaded". It has a spring holding the latch body to the base, which allows some misalignment between the latch and keeper. It also acts as a sort of "shock absorber" so the latch (or your enclosure) doesn't break in the event of an impact.
Often used on crates or large portable cases, Link Locks are incredibly strong for their compact size.
Keepers are ordered separately and can be found here: K5-2811-07.