Size description:
The following kinds of couplings are 14mm in diameter and 22mm in length.
4-4, one side aperture 4mm, the other end aperture 4mm; (side hole M4 machine screw)
4-5, one side aperture 4mm, the other end aperture 5mm;(side hole M4 machine screw)
4-6, one side aperture 4mm, the other end aperture 6mm;(side hole M4 machine screw)
5-5, one side aperture 5mm, the other end aperture 5mm; (side hole M4 machine screw)
5-6, one side aperture 5mm, the other end aperture 6mm; (side hole M4 machine screw)
5-8, one side aperture 5mm, the other end aperture 8mm; (side hole M4 machine screw)
6-6, one side aperture 6mm, the other end aperture 6mm; (side hole M4 machine screw)
6-8, one side aperture 6mm, the other end aperture 8mm; (side hole M4 machine screw)
8-8, one side aperture 8mm, the other end aperture 8mm; (side hole M4 machine screw)