I have a huge assortment of collets. Small to large. The largest being a 3-5/8" Camco. Some of the brands are Hardinge, Camco, Conamatic and Martin. Most of these collets came from a Davenport long bed automatic screw machine. They are dirty and dusty. I don't really know much about them. I know the pictures aren't that great but if you want to check them out let me know. I'm located in Lempster NH. I'd like to sell everything as a group for $500.