Arca Swiss type ball head is good because other Arca Swiss type inserts from other tripod heads can be used with this ball head. It has a built in spirit level on the side of the handle that is tightened with a QR clip, however this only works when the head is rotated to portrait mode. There is no spirit level on the top for landscape orientation. Firstly, this one has Ball head no safety pin lock that prevents the QR plate from slipping off if not fully tightened.It comes with a pair of set screws on the underside of the Swiss Arca plate that you can tighten on either side to ensure full slipping By default, both setscrews are installed in the base of the QR plate, if both are installed, you can d However, do not move or remove the slab as they protrude beyond the bottom of the slab to prevent slipping. You have to remove one of them. The large button to tighten the ball head works great. She holds her head good and tight. Overall, this is a good basic ball head. It doesn't have many of the other fancy features of some of the more expensive ball heads, but it doesn't cost that much either.
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