ZWO 200mm Pier Extension for AM3/AM5This pier extension from ZWO is designed for use with the AM5 mount and the ZWO carbon fiber tripod. Made from aircraft grade aluminum, this pier extension can resist high temperatures and wear. An impressive payload capacity of 110 pounds (50 kg) rounds out its features. The pier extension is lightweight, at only 3. 5 pounds (1. 6 kg). Installation with the AM5 is easy: simply attach the pier extension to the tripod, set the AM5 mount on the