"nok" series machines are available in the following version: nok75 - for diameters from 20 to 75 mm. nok120 - for diameters from 20 to 114 mm. (picture shown) notch-grinding machine for perfect joint preparation on piece......"nok" series machines are available in the following version: nok75 - for diameters from 20 to 75 mm. nok120 - for diameters from 20 to 114 mm. (picture shown) notch-grinding machine for perfect joint preparation on pieces with round, square, rectangular and irregular sections. on request the machine can be equipped with 2 grinding belt rotation speed (1400-2800 rpm.) machine is supplied ready to work with following standard equipment: n1 contact roller to execute notches with fix diameter, tilting clamping device for work-pieces, motors voltage 400v/50hz, n2 abrasive belts in different grits, service keys, instructions book and ce conformity declaration.