Waygate Krautkramer B-310 [118-540-310] 5-Step Calibration Block, Carbon Steel. Waygate Technologies Krautkramer Carbon Steel 5-Step Block, a Baker Hughes business product (formerly GE Inspection Technologies), for thickness and linearity calibration. This 5-Step block comes in thicknesses of .100", .200", .300", .400" and .500". Step face measures .750" x .750". In accordance with ASTM E797.