Mill tool holders

They are called Brown & Sharpe collets, with different numbers, like 11 and 21, and others I have both 11s and 21s.
Across the other side of the pond we have a different naming system for them but the geometry and function is the same.
 
The pointed pin is for a clarkson type toolholder, though I have no clue how to swap it out.
Still stuck on de double woodruff key cutters (Why does someone need 10 of those??
 
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