This pack of 4 well detialed girders comes in 3 lengths to fit different wagon lengths as well as looking great in any industrial scene. 
 
N gauge short girders - 33mm/2mm/3mm
N gauge medium girders - 65mm/2mm/4mm
N gauge long girders - 75mm/2mm/5mm
 
TT:120 gauge short girders - 41.5mm/2.5mm/3.75mm
TT:120 gauge medium girders - 81.5mm/2.5mm/5mm
TT:120 gauge long girders - 94mm/2.5mm/6.25mm
 
TT:3mm gauge short girders - 49.5mm/3mm/4.5mm
TT:3mm gauge medium girders - 81.5mm/3mm/6mm
TT:3mm gauge long girders - 94mm/3mm/7.5mm
 
00 gauge short girders - 66mm/4mm/6mm
00 gauge medium girders - 130mm/4mm/8mm
00 gauge long girders - 150mm//4mm/10mm