45mm Square Top U-Bolt measuring 165mm long from inside the U section and 46mm between the legs with 50mm thread length, made from 12.9mm (1/2") rod with a rolled whitworth thread.

A: 165mm (6-1/2")

B: 46mm (1-3/4")

C: 12.9mm (1/2")

D: 50mm (2")