Clamps,What are these????

[Carroll Courtney]

Guys I have several of these clamps that was purchase with a bundle of items.What are these used for and their made in the USA.Thanks for the help----Carroll

[Bob Glenn]

They look like machinists clamps. We had to make similar ones in metal shop during my college years. Still useful today, once you get on to how to adjust them.
Remember, you can never have too many clamps.

[Jim Rimmer]

+1 machinist clamps

[Kevin Groenke]

If they're Starretts, they're "Toolmaker's Parallel Clamps" #161: AA-E depending on size. $35-$50ea new.
http://www.indtool.co.nz/pages/products/imgs/STT2070.jpg

[Carroll Courtney]

Only marking they have are #4486 USA.Have about 12 of these,don't know what to do with them or use them for.----Carroll

[Steve Rozmiarek]

Carroll, they could be Unions rather than Starretts. Still great stuff. I use mine most often to temporarily attach dial gauges to various things for machine setup.

[Danny Burns]

http://www.leevalley.com/wood/page.aspx?c=2&p=64333&cat=51&ap=1

Machinist clamps alright!