The length of the coupling is unified as: 22mm,
The outer diameter of 14mm has: 4mm to 4mm, 4mm to 5mm, 4mm to 6mm, 5mm to 5mm, 5mm to 6mm, 5mm to 8mm, 6mm to 6mm, 6mm to 8mm, 8mm to 8mm.

It is made of No. 45 steel instead of stainless steel. It is a kind of iron, but harder than ordinary iron

The rigid coupling is a 90 degree fixed design and is fixed by four machine instrument screws

Each coupling is equipped with four mechanical screws, and each order is equipped with a tightening wrench

through hole design, the length of the two holes each accounts for half of the coupling

Size description: For example: 4mm to 4mm means that the diameter of one side is 4mm, and the diameter of the other end is 4mm.