Features：
100% brand new and high quality.
This joint or coupling connects rigid rods whose axes are inclined to each other.
Made of premium metal material, it is durable and has long service life.
It is commonly used for shafts that transmit rotary motion.
Widely used for connecting model cars, model ships, robots, etc.

Specifications:
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 x Universal Joint (with Set Screws)