NOS NEW in package Brompton crankset. 170mm arm length. silver color 50 tooth count 3/32" width. Pre 2013 production, older style with NON REMOVABLE chain ring and black plastic chain guard. Part number 9020058 part code QCW-FX-50 Left arm part number 9020034 Left arm part code QCRANKLH-FX See photos for reference. NO RETURNS Please check out our other items Thanks.