Pier Mount 90 for AM7/AM5NPier Mount 90 for AM7 and AM5N Built for the heavier payload with the ZWO AM7, the William Optics Pier Mount 90 provides a 90 kg 198 lbs payload capacity while weighing only about 7 kg 15 lbs. Pier Mount Plate has central 3 8" attachment screw, and three holes for additional connection with M6 screws to the ZWO AM5 and AM7, and other compatible mount heads. Included leveling feet allow precision adjustment for hard or soft surfaces. Does not include a