ALUMINUM SLEEVE NUT 1.ISO,ANSI,JIS,DIN,BS& non-standard fastener ... .Grade:4.8 ,6.8,8.8,9.8.......... ALUMINUM SLEEVE NUT,ALUMINUM WELD NUT,NUT A good non-standard fastenerS ... :They are used in most of places such as drywall,concrete,chipboard,machine,wood...2) Main export market:North America,South ...