1. Material: ABS 2. The size of 691 quick release plate: 70x42 mm, weight 35 grams 3. The size of 880 quick release plate: 80x50mm, weight 27g 4. The size of 998 quick release plate: 90x55mm, weight 46g 5. It assists you to position your camera right on the tripod head. 6. The quick release lock put off the camera from falling. 7. It assists you to position your camera right on the tripod head. The quick release lock put off the camera from falling. 8. A quick release plate can be kept attached to the camera base. This allows you to attach or remove the camera from the tripod quickly and easily without having to waste time fumbling with the threaded mount.