SmallRig 15mm Rod Clamp 15mm Rod Lock Knob Quick Release Rod Mount 90 Degree 15mm Rail Block - 2069 Excellent Features: One of the great features of this 15mm rod clamp can be installed on a 15mm rod standard rod with video rigs and other video equipment.Its versatility makes it easy to mix and match with a lot of equipment, and it can be used for almost any photography. EASY TO USE: The connection of the 15mm rod system and 15mm rod clamp is adopted a quick release method, which can be loosened the thumbscrew to easily separate the 15mm rod system and rod clamp.One hand operation Ratchet Lock Knobs: Rod clamp and 15mm rod system connection are ratcheted, which can be pulled and turned.When other accessories do not interfere with other accessories, you can pull the knob to adjust the screw.