Round Threaded Inserts Round Threaded Inserts Round internal fitting with thread Fits inside round tubular legs. click here on how to measure Please contact us if your have other requirements M6 Internal Thread RTi16M6 14mm inside 16mm outside M6 Metal Thread $1.10 (incl GST) M8 Internal Thread RTi22M8 19mm inside 22mm outside M8 Metal Thread $1.21 (incl GST) RTi25M8 22mm inside 25mm outside M8 Metal Thread $1.27 (incl GST) RTi28M8 25mm inside 28mm outside M8 Metal Thread $1.27 (incl GST) RTi32M8 29mm inside 32mm outside M8 Metal Thread $1.32 (incl GST) RTi38M8 35mm inside 38mm outside M8 Metal Thread $1.43 (incl GST)