Aftermarket 27-1/2 Drill Stem String Extension Sub

- 27-1/2" Drill Stem String Extension Sub Adapter for Cable Tool - Used - Crossover 4" X 5" female box to either 2 1/2" x 3 1/2" or 2 3/4" x 3 3/4" male pin thread connection, - With wrench squares. - Presumably American manufactured with carbon and/or alloy steels, but unsure if this is Acme, Spang, Gill Rock Drill, Ideco, Trident, Rampp, O.W.S. Co., Keystone or maybe another historical tooling manufacturer. - If you require thread protector(s) on tool joint(s) add another $15. - Located in Mifflinburg, PA USA