611862-516 Steel Rectangular Gage Block, ASME Grade K, 0.13mm Length 611862-516 Steel Rectangular Gage Block, ASME Grade K, 0.13mm Length If using only one length repeatedly it is a good idea to purchase discrete gage blocks Each gage block is supplied with a certificate of inspection Each grade K gage block of ASME standard is specially supplied with a certificate of calibration which certificates that the gage block was manufactured through interferometry