This is a 3/8 inch screw that can be used to attach camera mount plates or ball heads to the camera slider. You'll need to drill a hole in the carriage plate (or enlarge one of the existing holes).
Note that the screw may be slightly different from the one pictured (the head may be wider).
Dimensions
- Head diameter 15.0 mm
- Head thickness 3.5 mm
- Slot width 1.95 mm
- Slot depth 2.2 mm
- Shaft length 12.8 mm
- Threaded shaft section length 6.35 mm
- Thread 3/8-16 UNC (standard large camera thread)
- Unthreaded shaft section length 6.45 mm
- Unthreaded shaft section diameter 4.8 mm
- Overall length 16.3 mm