Mitutoyo 613202-516 2.0", RECT, CERA, ASME KPrecision gage blocks are the primary standards vital to dimensional quality control in the manufacture of parts Mitutoyo offers a complete selection of gage blocks available in a choice of rectangular or square, metric or inch and steel or CERA (ceramic) types CERA blocks, made of ceramic materials with superior surface quality, were developed by Mitutoyo's ultra-precision machining techniques and solve problems commonly associated with steel gage blocks If using only one length repeatedly, it is good practice to purchase discrete gage blocks Each gage block is supplied with a certificate of inspection Provided with inspection certificate