... /4'',SM1'',SM1-1/4'',SM1-1/2'',SN2'',SM2-1/2'',SM3'',SM3-1/2'',SM4''EMT,Electrical metal tube,electrical conduit,galvanized ... tubesLength:3.05mMareials:GalvanizingWall thickness:1.07-2.11mmExternal Diameter:17.93-114.30mmISO,UL(EMT)---Usage:expored and concealed work,use ...