The tiny bolt and wrench pictured here are what first brought Jerry Kieffer’s skills to the attention of Joe Martin. At the center of the bezel is a .25 x .075 x 2mm bolt and .4mm wrench. The .009” diameter hex bolt and nut were used as functional fasteners on Jerry’s 1/30 scale Corliss steam engine. Threads are only .0005” deep. Jerry also turned the knurled brass display bezel for the bolt and wrench. These miniatures are on display in the Miniature Engineering Craftsmanship Museum in Carlsbad, CA, along with some of Jerry’s other work.