It could be a vintage hydraulic valve lifter puller with a part missing and maybe a handle missing too. A piece slides to squeeze together and/or expand. I have one similar. This is not the best picture but something like this. http://www.amazon.com/dp/B001CZCV2W/?tag=treasurenet01-20White Feather said:It looks like a puller of some type. I've seen pullers for the old style engine lifters that are very similar to this.