Specifications: Model: Clip Product type: Camera related accessories Color: Black Material: Aluminum alloy Widely adjustment range: Open: 38mm; Recommend clamp product: 13mm-30mm in diameter. Features: 1. Multi-functional: The dual ballhead can be mounted directly to a DSLR or camcorder shoe mount, to provide good photography studio shooting and shake-free stability. 2. Double ballhead: With a cold shoe adapter and a 1/4-inch screw,the universal ballhead allows for the attachment of a full array of video accessories to your camera while shooting video. 3. Security lock knob the double ballhead can be instantly locked off in any position for fast and safe operation;With 180 degree swivel articulation for easy direction. 4. It has a female 1/4 inch and a 3/8 inch, both the standard fitting sizes in the photo industry for heads and tripods can be used for a variety of attachments. 5. Super crab clamp is made of solid anti-rust aluminum alloy for high durability. Non-slip rubbers on the inner side provide strength and stability. Packaging includes: 1x Crab Pliers Clip 1x Ball Mount