Benro IB1 Triple Action Ballhead with PU60 PlateThe IB1 Triple Action Ball Head is an Arca type compatible head with a load capacity of 17. 6 lb. It stands 3. 8" high, and weighs 12. 8 oz. There are separate locks for both the ball movement and the 360 panning motion, as well as a friction control knob. A 90 notch makes it easy to switch to portrait orientation. The numbered scale on the head's base allows for easily repeatable pans, and a bull's eye bubble helps ensure they head is level with the