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You are buying a new old stock military track jack. The government nomenclature is- "fixture, track connecting, full tracked vehicle"that was used on the removing and installing tracks of tanks and high speed tractor tracks. The part number is 12252120 and the NSN is 5120-01-016-2149. It is similar to a giant C clamp with a clamping force of 9,000 -18,000 pounds. It has a square 3/4 inch drive receiving hole. The jaws spread around 14 1/2 inch spread. I do not know what exactly what vehicle this fixture will work on. I am sure they could be modified for any similar use. It has some oxidation and warehouse crud from long term storage. It ships 45 pounds UPS at buyer's expense. Ohio buyers have to pay sales tax. Sold "as is".