173C-4 cutting tips are precision machined from high quality copper alloys for durability. The gas passages or single-piece acetylene tips are accurately swaged-formed and shaped on polished mandrels for smooth and efficient gas flow. Dual-piece tips, featuring an internal spline configuration are designed for alternate fuel gases, and offer the optimum in cutting performance. High speed cutting tips feature stainless steel insert core for longer life. All tips are 100% flame tested.