Discover:the size is completesize Thread size=complete length-both finish Checklist 1 x Screw with Finish Machined by Drawing 1 x SFU2005/2010 Single Nut 1 x Nut Housing DSG20H 1 x BK15 1 x BF15 1 x Coupler (interiorgap 8mm*12mm) --For those whowant couplings of different sizes, please make an observation or contact us:) #For those whowantdifferent lengths, we are able tocustomise them for you. Please contact us:) Beneficialsize: the longer the size, the smaller the diameter, the simplerit's to bend 1.100-1000mm Beneficial SFU1204/SFU1605/SFU2005/SFU2505/SFU3205 2.1000-1600mm Beneficial SFU1605/SFU2005/SFU2505/SFU3205 3.1600-2000mm Beneficial SFU2005/SFU2505/SFU3205 4.2000-2500mm Beneficial SFU2505/SFU3205 5.2500mm+ Suggest SFU3205 SFU2005 SFU2010 drawing