These insert rubbers are replacement parts for the Trivio maintaining supports Elite and Master. By clamping bicycles in these standards, the insert rubbers wear out after a while and it is necessary to replace them occasionally. They are made of soft rubber so that your frame can not get damaged when fixed.
This spare part forms the base with which the mounting standard Pro touches the ground. It must be attached to the ends of the foot tubes that hold the Pro work standard straight up. This way it stands stable without damaging the floor.