the bolt holes defined by edges 14 and 15 into coaxial alignment the term mailable in this application means that the blank may be physically bent or deformed to bring the abutment portions and bolt holes into the described configuration where they will remain until additional forces act to alter the position center portion 13 has to have sufficient mass to allow the bending of the shim into this configuration the exact curvature assumed by central portion 13 is not critical as long as portions 11 and 12 assume their intended positions thus the shim could be formed with two bends at the intersection of the central portion with the two abutment portions and the central portion 13 by way of example the shim blank may be formed from 0 020 steel and have an is overall length of about 2 25 inches abutment portions 11 and 12 may have an outer diameter of 1 inch and the inner edges 14 and 15 may define bolt holes which have a diameter of about 0 75 inches it is to be understood that the specific bolt hole size will be determined by the size bolts being used in the particular flange installation when the shim.