A quick release plate can be kept attached to the camera's base and allows the user to quickly and easily attach or remove the camera from the tripod without having to waste time fumbling with the threaded mount</br>1/4 inch tripod socket</br>QB-4W: Length 66mm(2.6</br>Bottom Size: 44mm(1.73</br>Spare Quick release plate 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</br></br>Product Description</br></br><p>Description:<br /> Allows to set 2 cameras in one tripod. Removable quick-release plate?? comes with 1/4"itable for all SLR cameras; 3/8" screw mount at the bottom?? can be widely applied to various professional tripods.</p> <p>Specification:<br /> Material: Aluminum Alloy<br /> Net Weight: 410g<br /> Length: 31cm<br /> Maximum Load: 8kg<br /> Quick-release plate size: 50 x 50 x 9mm<br /> Quick release plates: Benro?? Arca Swiss standard compatible</p> <p>Package included:<br /> 1 x Quick Release Plate</p></br><br/>http://www.amazon.com/gp/product/B00RB8TA3MMhigh qual