SB Shaft Couplings Model d1 d2 D L SB15X20 2,4,5mm 2,4,5,6,8mm 15 20 SB16X16 2,3,3.17,4,5,6,6.35,8mm 2,4,5,6,6.35,8mm sixteen sixteen SB18X25 4,5,6mm 5,6,8mm 18 25 SB20X20 2,3,5,6,6.35,8,10mm 5,6,8,10mm 20 20 SB20X25 2, 3, 3.17, 4, 5, 6, 6.35, 8mm 3, 4, 5, 6, 6.35, 8, 9.5, 10mm 20 25 SB20X25 8, 9.5, 10mm 9.5, 10mm 20 25 SB20X30 3,5,6.35mm 3,8,10mm 20 30 SB25X25 4,5,6.35,8,12mm 4,8,12mm 25 25 SB25X30 5,6,6.35,8,9,9.5,10,12mm 5,6,6.35,8,9.52,10,12mm 25 30 SB25X35 6mm 7mm 25 35 SB25X40 5,6,6.35,8,10mm 6,6.35,7,8,10,12mm 25 forty SB30X35 5, 6, 6.35, 15, 16mm 6, 8, 12, 14, 15, 16mm 30 35 SB30X40 5,6,6.35/8/9/10/11/12.7/14mm 5,8,9.5,10,12,12.7,14,15,16mm 30 forty SB32X45 8mm 14mm 32 45 SB40X45 5,8mm 8,12,14mm 40 45 SB40X50 8,16mm 8,10,12,16mm forty 50 SB40X55 8,10,11,12,14,17,19mm 8,14,16,17,18,20mm 40 55 SB40X60 14,16,17mm 15,16,17mm forty 60 SB55X65 9.52mm 9.52mm fifty five 65 SB65X90 20,30mm 20,30mm sixty five 90 D20L20 Rigid Clamping Couplings Diameter: 20mm Length: 20mm For example d1xd2 (mm): 2*10 , 3*8 , 5*5 , 5*8 , 5*10 , 6*6 , 6*8 , 6.35*8 , 8*8 , 8*10 , 10*10 . Material: aluminum alloy Packing content: 1pcs coupling