Square Threaded Inserts Square Threaded Inserts Square internal fitting with thread Fits inside square tubular legs. click here on how to measure Please contact us if your have other requirements M6 Internal Thread STi22M6 19mm x 19mm inside 22mm x 22mm outside M6 Metal Thread $1.32 (incl GST) M8 Internal Thread STi25M8 22mm x 22mm inside 25mm x 25mm outside M8 Metal Thread $0.99 (incl GST) STi30M8 28mm x 28mm inside 30mm x 30mm outside M8 Metal Thread $0.99 (incl GST) STi32M8 29mm x 29mm inside 32mm x 32mm outside M8 Metal Thread $1.21 (incl GST) STi38M8 35mm x 35mm inside 38mm x 38mm outside M8 Metal Thread $1.32 (incl GST) STi50M8 47mm x 47mm inside 50mm x 50mm outside M8 Metal Thread $1.65 (incl GST) M10 Internal Thread STi25M10 22mm x 22mm inside 25mm x 25mm outside M8 Metal Thread $1.60 (incl GST)