Extensible round sleeve for round tube with inner diameter 21 mm to 23 mm.
This sleeve is very useful for attaching a castor wheel with a central hole onto a tube. In effect, the more you screw, the more the sleeve expands in the tube. This enables you to achieve a very solid attachment by a very simple means.
The sleeve is composed of a steel bolt, grey nylon housing and two conical elements at each end, also in nylon.
If the tube you have does not correspond to these dimensions, please check out the other extensible sleeve models. You can find the references for round or square tubes from 18 mm to 33 mm, which correspond to the majority of tubes on the market.