Posted by Michael Gilligan on 15/12/2019 08:49:29:
The number on the box is a ‘National Stock Number’
Searching for nsn 5130-12-145-6396 will get you to some basic descriptions of the drill and related parts.
Looks a useful bit of kit 
MichaelG.
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Edit: The underlining in my post is ‘just another feature’ of the forum software … I have tried, and failed, to remove it.
Edited By Michael Gilligan on 15/12/2019 09:01:03
Pedant alert: Only in the USA is it called the 'National Stock Number', for everyone else it's the NATO Stock-Number.
The two digit code is the country of registration; USA military items are almost always '00' or '01'. UK registered items are '99'. '12' is Germany.:
What's slightly odd is a German Drill, with a German NATO stock-number, in a German Box, marked 'US Property'! My guess is the drill is of US manufacture, made by contract for the US military with a US NATO stock number, but the same drill has been bought by the German Army and registered by them.
The main purpose of NATO stock numbers is to allow national forces to control their supply systems. NSNs are catalogue numbers allowing military items to be quickly identified, replenished and – absolute top priority – accounted and paid for. Normally the US Army willnot draw on British stores, or even those of the US Navy, but in a shooting war the system allows NATO forces to source equipment and stores from each other, tri-service and/or internationally.
Military gear is usually exceptionally well-made, but beware this may not be a good thing. An old MoD joke is that a TV set made for the armed forces will be waterproof to 20metres, shock-proof and radiation hardened, receive all known TV signals from anywhere in the world, and be made of nothing but the very best materials, all silver-plated. Unfortunately, it will need three highly-trained operators, weigh 500kg, require a 110V 400Hz 3-phase supply, have special plugs and sockets, be £2M per-set over budget and 15 years late. Also, it won't work…
Dave