?with?abrasive?belt?of?grit#100-#200,?have?better?brightness?with?
discontinuous?coarse?stria,?used?as?inner?and?external?ornaments?for?building,?
electrical?appliances?and?kitchen?utensils?etc.
?
No.4 :olished?with?abrasive?belt?of?grit?#150-#180,have?better?brightness?with?
discontinuous?coarse?stria,?but?thinner?than?No3,?are?used?as?bathtub?buildings?
inner?and?external?ornaments?electrical?appliances?