15-1/2” Diameter X 48" Length Steel Chisel Bit for Cable Tool
Used
48" length,
3" X 4" API Pin Chisel Digging Weight for Water oil gas foundation caisson drill rig.
Marked 18" Diameter but measures nearer to 15-1/2" width.
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.