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 fit the Stainless Steel Stand (SS1). Measurements: 18 inches vertically and 12 inches horizontally Approx 46 x 30.5 cm). 12mm diameter THIS L BAR IS FOR THE SS1 DELUXE STAINLESS STEEL WORKSTAND