Firstly tapers horizontally from a 6 mm OD for 110 mm, then tapers vertically 45 mm down from 3 mm to 2 mm OD, and then terminates in a ‘hook’ design, which continues to tapers horizontally for 10 mm, and then tapers vertically up for 6 mm, which the end locks its 7 mm long 0.015" stainless steel wire.