Bullet_point: ['Also included is 1 optical flat that is 1" diameter X .5125" thickness with .000004" flatness and is .00002" parallel', 'Complete with aluminum carrying case', 'Each block comes with a certificate of calibration', 'Set includes 9 grade 0 gage blocks including .0625", .100", .125", .200", .250", .300", .500", 1.00", & 2.00"'] (Page 1)