CALIBRATE STANDARD BLOCK RET 55X45M – BASIC BLOCK NAME MODIFIER NAME STANDARD RECTANGULAR SHAPEPRIMARY STEEL MATERIALCLASS SIZE 55 X 45 MMCALIBRATION WITH CERTIFIERADDITIONAL REQUIREMENTS SEE COMMERCIAL OBS. MITUTOYO-178-606 NOTE: ROUGHNESS OF 1 MICROMETER RA. SPECIFICATION NOTE:- THE STANDARD BLOCK MUST COME FREE FROM DAMAGE ON THE MEASUREMENT SURFACE;- THE SUPPLIER MUST SEND THE CERTIFICATE WITH RBC CO-PROOF.