Tungsten ring high accuracy and non magnetism , made of metal Materials: pure tungsetn 99.95% Min Size: OD75* ID35* H15 Tungsten ringTungsten ring high accuracy and non magnetism , made of metalMaterials: pure tungsetn 99.95% MinSize: OD75* ID35* H15Surface finish : grind finish Ra1.6Min, machined fubusg Ra3.2Min, sinter blank surface .Main specifications : water drop, bullet, round pipe and ...