Mushroom connectors for hollow round plastic drive belts. Click the down arrow in the size box to choose the correct one for your belt: The size of the connector refers to the diameter of the belt material - not the size of the hole in the belt.  Connectors for belts of the following diameters are available: 5mm, 6mm, 8mm, 10mm and 12mm are available. To order hollow belting, please click here