The Extra Long L Bar helps when you need a bit more width to your frame - for example if you have a wide arm to your chair or you have a larger piece of work. This Extra Long L Bar will fir the silver grey SG1 stand or any of the coloured stands. Measurements: 18 inches vertically and 12 inches horizontally Approx 46 x 30.5 cm). 12mm diameter THIS L BAR IS FOR THE SG1 SILVER GREY WORKSTAND OR ANY COLOURED WORKSTANDS, THERE IS A SEPARATE LISTING FOR THE STAINLESS STEEL VERSION