Contraplex CS impact stud mill. 10mm dia x 46mm long high CS pins 3/50/380/660 volt UL label. Door rotor belt driven by 14 HP (11 KW), 3/50/380/660 volt, 1440 rpm motor, UL label. Housing rotor has (3) rows, (143) pins. Pin disc max 8400 rpm. Door pin disc (3) rows, (134) pins, max 4500 rpm. Pins on mill and door are 1 1/8".