1) Material: Aluminum2) Size: From 1/2" to 4",set-screw type & compression type2) Manufactured to UL 514B specifications3) Concrete-tight when taped.4) For use in dry locations to couple two ends of EMT conduit or conduit box.Interested buyers pls feel free to contact me asapWe are looking forward to your kind enquiries.Contact Person: Bruce RedCompany: EVT Electrical Co., Ltd. Mobile:86-13958127096T#:86-571-82450872F#:86-571-82230156E-mail:bruceling88(at)gma1l. c0mMSN: Bruce_ling88(at)h0tma1l. c0mYahootalk:bruceling88@yah00.c0mSkype:evt_electrical