***** **********Best Quality Guranteed. *****OPEN TO 54MM It is a Multi-Function Double Ball Head with bottom clamp and 1/4" screw, the clamp jaws open to 54mm. It could attach monitor or video light on the other end, while clamps the accessories with diameter less than 54mm, like stabilizer for DJI, stabilizer, video C-stand etc *****LOCK TIGHTIt can mount Monitors and led Lights to DSLR, 360 degree Articulation when shooting, this ball head has a single locking knob for fast and safe operation, 1/4" Screw on the top *****DIRECT MOUNTINGCan be mounted directly to a DSLR or camcorder's shoe mount and mounted directly to any rods, tube up to 54mm diameter, and allows for the attachment of a full array of video accessories *****MULTIPLE ACCESSORIES ATTACHCan also be used as a GoPro mount on motorbike or hold a microphone on a boom arm, mount of small cameras, monitors, compact cameras, phones, flashes, handheld gimbals and other devices, sush as for GoPro cameras, Nex mirrorless came