The EZ Grip Finger has a 5/8" (16mm) socket inside or 1.1" (28mm) outside. It is attached to a ball joint so it pivots from -45°to 90°while the collar rotates 360° incorporates a 5/8” pin. hold a small lighting fixture. The inside is a 3/8"-16 thread which will accept the standard dot and camera accessories. Weight: 0.86kg (1.90lbs)