... alloy 2.Process:die-casting 3.Size: Custom Aluminum alloy Classic Motorcycle gearbox cover1.Raw material:aluminum alloy (zinc, magnesium, ... ,annealing.6.Follow-up processing: 1)Ordinary processing: cutting, deburring, sand blasting, polishing, grinding, heat treatment, thermal explosion. 2)Machining: ... PARTS CO., LTD sincerely to cooperate with you! Aluminum alloy Classic Motorcycle gearbox cover