... years' testing on cutting machine, then we started to promote this gearbox. Gearbox all look same each other, ... one or two years working, some would start to get problem, but the good one still work ... same...There're quite many gearbox on market for CNC cutting machine, but after years' practice, ... problem after 3 years' sale.This gearbox is mainly for Panasonic A4,A5, Mitusbishi E, J2S series.... ...