Expandable round socket for round tube with an inner diameter of 19 mm to 21.5 mm.
This socket is very useful for fixing a castor with a central hole in a tube. Indeed, the more you screw, the more the socket expands in the tube. This allows for a very strong fixation while remaining very simple to use.
The socket consists of a 10 mm diameter stainless steel bolt, a black nylon body, a conical piece, and a washer.
If the tube you have does not match this dimension, feel free to check other models of expandable sockets. You will find references for round or square tubes ranging from 18 mm to 32 mm, which corresponds to the majority of tubes on the market.
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