21.3 mm (0.84") ID
60.3 mm (2.37") OD
60.3 mm (2.37") OD
The machining capacity of the GR40 is 21.3 mm (0.839“) ID to max. 60.3 mm (2.374“) OD. The PROTEM GR40 is specifically designed for boiler panels and waterwall cutout windows.