... /2'',SN2'',SM2-1/2'',SM3'',SM3-1/2'',SM4''EMT,Electrical metal tube,electrical conduit,galvanized tubesLength:3.05mMareials:GalvanizingWall ... :1.07-2.11mmExternal Diameter:17.93-114.30mmISO,UL(EMT)---Usage:expored and concealed work,use above ground or light ... and other power application---Corrosion and abrasion resistance New type EMT