48.3 mm (1.90") ID
114.3 mm (4.50") OD
114.3 mm (4.50") OD
The machining capacity of the GR120 is 48.3 mm (1.902“) ID to max. 114.3 mm (4.5“) OD. The PROTEM GR120 is specifically designed for boiler panels and waterwall cutout windows.