... and cheap price 4. Systematic QC net GB 812 large size Black Zinc Slotted Nut 1.Material:Carbon steel,stainless steel,Aluminum ... need.2.Surface Finish:black oxide, black zinc, passivated, phosphated, guild, nickel plated, chromnium and etc.3. Size: Normal size from M2-M36 or ... with the good quality and competitive price. GB 812 large size Black Zinc Slotted Nut