Views:32 Author:Site Editor Publish Time: 2021-04-15 Origin:Site
Normal black nut have 2 kinds, one is black electrophoretic nut, the other is black chrome nut.
Compare inner hole of nut:
black electrophoretic nut, black in appearance and inner hole
Black chrome nut, appearance is black, but inner hole is silver.
Steel + Black nickel + Black nickel + Black chrome
The degree of black