A-OL2050-AI 2050 Extended Pitch Offset Link (USA)One New Aftermarket Replacement 2050 Extended Pitch Offset Link This 2050 extended pitch offset link (also called a half link) is used to adjust the length of #2050 double pitch roller chain by one half pitch increment, and for chain repairs. It is manufactured in the USA to ANSI standard B29. 1 and is compatible with all #2050 extended pitch roller chain used across agricultural equipment, conveyors, planters, seeders, and material handling systems.