SOONWELL Tripod Mount Cheese Baseplate Adapter 15mm Rod Support DSLR Rig Clamp This plate provides mounting holes to attach many different kinds of accessories to your on camera It attaches to the camera rig via 15mm lightweight rod clamps and has 15 1/4'' screw holes and 15 3/8'' screw holes This plate can be used to attach on-camera monitors, articulating arms ect Rail dia: 15mm Material: aiuminum alloy