Specification:
Material: Iron 45 steel (exquisite plating)
Inner Diameter:2*2mm, 2*2.3mm, 2.3*2.3mm, 2*3mm, 2*4mm, 2.3*3mm, 2.3*4mm, 3*3mm, 3*4mm, 3*5mm, 3.17*3.17mm,3.17*4mm, 4*4mm,4*5mm, 4*6mm, 5*5mm, 5*6mm, 6*6mm, 5*8mm, 6*8mm, 8*8mm, 8*10mm,10*10mm(Optional)

2.3-2.3, 2*2.3, 2-2 outside diameter 8mm,length 18mm, weight About 8g, side fixed hole for the M3.
2.3-3, 3*3, 3*3.17, 3.17*3.17 outside diameter 9mm,length 23mm, weight About 8g, side fixed hole for the M3.
3.175-4, 4-3, 4-4 , 4*2.3 outside diameter 9mm, length 23mm ,weight About 8g, side fixed hole for the M3.
5-4, 3-5,5-5, 4-6, 5-6 ,6-6 outside diameter 11mm,length 23mm,weight About 10g, side fixed hole for the M4.
5-8 6-8 8*8 outside diameter 14mm,length 35mm,weight About 20g ,side fixed hole for the M4.
8*10, 10*10 outside diameter 16mm,length 35mm,weight About 28g , side fixed hole for the M4.

Package included:
1 * Universal Joint (with Set Screws)