It assists you to position your camera right on the tripod head. The quick release lock put off the camera from falling. The quick release lock is also helpful in locating the camera easily. It is Perfect for digital, 35mm, medium or camera, video camera, binoculars or scopes. It includes 1/4 inch -20 threaded camera screw and video pin. A quick release plate can be attached to the camera's base. This allows you to attach or the camera from the tripod quickly and easily without having to waste time fumbling with the threaded mount. Compatible For: PH-368 (PH368) -686 (CX686) C-600 (C600) D-600 (D600) -870RM (VCT870RM) Bottom interface size: 6.8 x 6.2cm Color: Black Material: ABS Package Includes: 2 x QB-6RL Quick Release Plate Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.