This is a 17 mm Allen Wrench which fits VW transmissions, and obviously anything else that needs a 17mm Allen wrench. I purchased this around 1970 when I had a VW, and it has just been in my took box unused for about 50 years. Photos are of the actual item for sale. The steel ruler shown is not a part of this sale.
Depending on your shipping location, the priority mail flat rate envelop may be the lowest cost option.