Master Setting Discs are ideal for calibrating and setting comparators, snap gages and other precision measuring instruments. Master Setting Discs are furnished with insulating grips to prevent heat distortion from handling. They are available in gagemaker tolerances from class XX thru class Z. Master Setting Discs are offered in high quality tool steel, chrome and carbide materials for longer life. They are available in 3 styles for various applications. Master Setting Discs conform to ANSI B47.1. They are ring lapped to size, and polished. Roundness and taper of all gages does not exceed 50% of the applicable gagemaker’s size tolerance and are non-accumulative. Sizes are available up to 23 inches in style #3.