Aftermarket 18-1/2 Crossover Sub Adapter Drill Too

- 18-1/2" Crossover Sub Adapter Drill Tool Joint Threads Coupler - 2-1/4" x 3-1/4" pin to 1-1/2" x 2-1/4" box, - 8-1/2" shoulder-to-shoulder length, - Complete 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