34-852-4 Motorized Punch GrinderMotorized Punch Grinder Features include For Diameters from 0. 059" to 1" Can be placed on the bed of a surface grinder for precision cylindrical grinding. Rollers are used to adjust the workpiece before grinding. Accuracy of the rollers is within 0. 0002". Eliminates need to manually turn workpiece, permits additional operations such as taper grinding with a sine plate. Workpiece length up to 4. 7" with a max grinding length of 0. 200" 1. 375".