This is a great ballhead. There is a lock for the quick release to stop accidental release. It has a bezel which is divided into degrees and one single locking knob which can be sucessfully used for panoramic pictures.
This will mount onto tripods with either 3/8th thread or with the adaptor supplied 1/4 thread. It allows you to mount up to four heads, two at 90 degrees and two adjustable mounts.
Off Centre Ballhead. The head will go in any position and locks with the twist of the knob. It has a seperate lock for the base which has degrees marked around it and is very useful for panoramic shots.