Neodymium Iron Boron Magnets we can manufacture according to clients requirste both for shape and for size; Neodymium Iron Boron MagnetsRing TypeOut Diameter(mm) Inside Diameter(mm) Thickness(mm) Max100 8030 Min 2.61.8 0.5 Tolerance +/-0.1 +/-0.1 +/-0.1 Surface Treatment Type Detail Specification Metal Zn; Ni; Golden Silver organic Epoxy; Ni+epoxy temporary passivation we can manufacture ...