Early lathes, light-duty milling machines, drills, Singer and other makes of sewing machine and assorted power tools were often driven by a round leather belt, sometimes referred to in contemporary literature as a "gut" drive. This is still available and usually in stock for immediate delivery. The belts are joined by a simple, pre-formed wire clip that is supplied with all orders except for the 3 mm where a short length of strong but flexible wire is the best solution. A hole is made in each end of the belt with a sharpened nail, the clip threaded through and squeezed together with a pair of pliers. PLEASE NOTE: being leather, diameters are nominal and can vary a little (either larger or smaller) than listed.