Universal joint description:
3mm-8mm means the aperture of one side is 3mm and the aperture of the other side is 8mm. (M4 machine screw for side hole)
8mm-10mm means the aperture of one side is 8mm and the aperture of the other side is 10mm. (M4 machine screw for side hole)
Material: fine electroplating of iron
8-8mm outer diameter 14mm, length 25mm, M4 side fixed hole with 4 screws and one wrench
8-10.10-10mm outer diameter 16mm, length 34mm, side fixed hole M4 with 4 screws a wrench
Part Number: XHK-0372