Topaz EMT connectors with set screw type assembly provide secure concrete tight protection when taped and are available in sizes from 1/2" to 4". Applications include use in dry locations to bond EMT thin wall conduits to electrical boxes or enclosures. Model sizes 2- 1/2" to 4" are suitable for both EMT and rigid conduit. Assemblies include steel locknut; constructed of strong and long lasting steel with zinc plated finish; most sizes UL listed. NEMA/ANSI FB-1 compliant.