Universal Quick Release QR Plate Tripod Head for Velbon CX-444 CX-888 CX-460 CX-460mini CX-470 CX-570 CX-690 DF-50/ SONY VCT-D580RM VCT-D680RM VCT-R640 / QB-4W Suitable for Velbon CX-444, CX-888, CX-460, CX-460mini, CX-470, CX-570, CX-690, DF-50,SONY VCT-D580RM, VCT-D680RM, VCT-R640 QR release plates attach to the tripod mount on your camera and allow you to quickly and easily attach and detach your camera from a compatible tripod head Extra QR plates allow you to conveniently swap out more than one camera with the same tripod. Size: Length 66mm (2.6") x Width 52mm(2.05") Bottom Size: 44mm(1.73") x 44mm(1.73")