Drill String Stem Extension Sub Adapter Crossover for water oil gas well rig
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