110mm to back of hood to focus point
2.25 inches in diameter

the flash is 10.5mm by 21mm

65.75mm diameter of the front face
68mm is the widest front part 

9mm tall which is 68mm at the widest point

+0.5mm of inner front ring (in front of front plane) which is 58.75mm in diameter

3.556mm (140 thou) behind front plane is the locking feature which is 65.75mm in diameter with 2 tabs to the widest diameter which are 90 degrees each.

3.55mm