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The PRS Knob from FLM is an attachment for all of their FT panning ball heads. It is attached by removing the blind cap on the ball head and mounting the knob. When panning, it locks the head every 15° and makes an audible click, so when shooting panoramas you don't have to look at the degree markings on the head to know when to take your shot. It also has a quick locking mechanism at 0° that allows you to quickly attach or remove the head to or from your tripod.