FTL-76 76mm High Precision Add-On Offset Bubble Spirit Level Plate for Tripod Ball Head 1. Can be easily installed between ball head and the tripod platform. 2. 76mm diameter of the horizontal disc, used to satisfy most bases. 3. Convenient to observe the level when opening the tripod. 4. 15mm diameter of the bubble level, clear and intuitive. 5. Fits for any ball head with base diameter no larger than 76mm. 6. Gives an accurate spirit level reading for the base of your ball head. 7. Can accommodate any 38 inch or 14 inch tripod stud. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.