Emco  Unimat SL / DB200 Lathe Thread Cutting Former & Guide also called a pattern bushing - Size 16G
For use with the Unimat thread cutting/chasing attachment No. 1270
Cuts precision threads with the Unimat DB 200 or SL 1000 lathe. -fits over the Unimat 3 jaw chuck. -brass thread follower is included.
Slight discoloration from old oil.
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Thank you for looking.