Please specify size(s) needed in comment section.
Some codes require that shims be used under penetrameters to compensate for thickness of a backing ring or weld reinforcement. Shims are supplied in the same materials as penetrameters. They are available in 1/16″ increments, from 1/16″ through 1″ thick. These dimensions allow approximately 1/8″ clearance on each side of the penetrameter with which they are to be used. Material and size identification indicating actual thickness is marked on each shim.