BJ-SACK-NUT: 1.stainless steel casting. 2.silicon sol technique ... :ASTM,AISI,DIN,JIS etc. 4.OEM service is offered. BJ-sack- nut:1.stainless steel casting.2.available material:stainless ... nut,screw bolt, pipe fitting,impellermcoupling parts and so on. BJ-SACK-NUT