... steel ball Material ,SS201 304 316 420 and brass Diameter,smallest size 6mm hollow ball Free sample ... chemical industry, avigation, Plastic hardware etc· Material , SS201 SS304 and brass . · Diameter,6-1000mm hollow· Packing , by ... steel.it is nonmagnetic,but magnetic after rolling, and the magnetism can be taken out, HRC≤26 ... , 16 ,18mm . which is widely used in pearls and jewels .3. 19 25 30 32 35 38 42 51 ...