The material is SS304,in order to connect other part there is a 9.45 mm groove in one side of it.The shaft is a cylindrical object worn in the middle of the bearing or in the middle of the wheel or in the middle of the gear.The process is CNC machining,milling and deburrs,the N.W is 0.019kgs.the production time for 2000 pieces is 20-25 days.