Portable boring and welding complex AVANTECHNO 411 is the most universal and popular tool for reconditioning of cylindrical surfaces. It is designed for bores with diameter range from 42 to 400 mm (from 22 mm with extra kit) which allows to solve the wide range of problems in most of the industries. Mobile boring complex AVANTECHNO 411B is a less costly version of the machine and allows to bore the openings with diameter range from 42 to 400 mm (from 22 mm with extra kit), without welding function.