Production of black countersunk self tapping screws or such manufacturers worry-free
Production of black countersunk self tapping screws or such manufacturers worry-free Mr. Li is being an electronic product company. Last year, he found a screw manufacturer near his company to make black countersunk self tapping screws . There was no big problem when it was just starting to supply. However, after the screw has been used for a while, it will basically rust. Mr. Li has responded to this issue several times with this manufacturer. They also assured Mr. Li that this problem will not occur again when the black countersunk self tapping screws are used for the next time. After the next delivery, there was no such problem, but a new problem appeared, that is, some of the screws were eccentric. Mr. Li and the manufacturer indicated that they would like to have a full inspection of the manufacturer and provide a material report. Mr. Li thinks that he has said this to the manufacturer, and there will be no problem when the next supply. As a re...