This is clutch booster, its OEM number is 809-03002, it’s a normal small item, the diameter is 5”, it is used for Mitsubishi Fuso and Canter 4D34/35, it has another number 810-03101, the market for this item is Indonesia, Vietnam and so on, there will be 12pcs in one cartons when packed, the weight of one carton is about 19kgs.