The couplers are designed to provide high tensile strength connections with external ribs or spanner flats, for easy gripping by hand tools; such as spanner, pipe wrench and chain wrench etc.

• No heat applied, no upsetting, no thread cutting
• Through normal-temperature swaging, original stress-resistance in tension and compression force is ensured
• Concrete placement is easy thanks to the small diameter and short length of the coupler
• Couplers are available for dissimilar sizes on request