Bevel gear set, spiral, module 1, no. of teeth 20/50, ratio 2.5:1, steel 42CrMo4, teeth hardened. The supplied pictures and technical drawings are made with reasonable care. Nevertheless, liability is excluded for the accuracy and correctness of this data. Note for ordering: These gears are sold singularly, not by pair. For a pair of bevel gears, you have to order two matching gears of the same module and ratio.