Extensible square sleeve for square tube of 21 mm to 23 mm
The sleeve is composed of a steel bolt, black nylon housing and two conical elements at each end, also in nylon.
It is mainly used with castor wheels with eye (with central hole) for attachment onto a tube by expansion of the sleeve. It simplifies the mounting of your castor wheels onto all your furniture.
Available in different sizes, to choose based on the inner diameter of your tube.