▶ OPEN TO 40MM： It is a Multi-Function Double Ball Head with bottom clamp and 1/4" screw, the clamp jaws open to 40mm. It could attach monitor or video light on the other end, while clamps the accessories with diameter less than 40mm, like stabilizer for DJI , stabilizer, video C-stand etc ▶ LOCK TIGHT：It 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 MOUNTING：Can be mounted directly to a DSLR or camcorder's shoe mount and mounted directly to any rods, tube up to 40mm diameter, and allows for the attachment of a full array of video accessories ▶ MULTIPLE ACCESSORIES ATTACH：Can also be used as for 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 cameras for compatible with Sony , RX100MK4 etc ▶ ERGONOMIC AND SOILD：Made of nearly all metal ( aluminium alloy ), solid and sturdy, also with a protective dense rubber pad on clamp area to prevent scratches and the whole arm can be taken off