This is for qty.2 Good used collets, one is 11/16" and one is 3/16. 

The threads are also in good shape yet

The thread diameter is approx. .852" and 20 tpi threads per inch right hand

Model 2

Overall Length is 3-3/8"

At the end of the threads the body measures .860" diameter.

The outside diameter of the largest part of the collet which

is the head measures about 1.115" 

Old vintage tooling made in the US America