【Humanized Design】The T-lever on the NB46 is longer on one end to help you lock the ball down solidly. It is spring loaded; simply pull it out to reposition the lever to allow it to clear wider tripod platforms.Double U-shaped groove design, You can easily switch into vertical shooting mode from horizontal mode.The strip hole on one side of the Arca-Swiss quick release plate can be used to install wrist strap.