... widely used in many areas ,with high quality and good delivery. Metallic rasching rings are simple shaped, with the same size ... of height and diameter. Large size of the rings (100 MM above) use the whole build ... Materials:stainless steels,carbon steels,aluminium,copper,bronze,304L,316L and aluminium permeated steels,improved polypropylene,improved Nylon6,Nylon66,reinforce ...