Plain Ali 900Plain Ali 900mm Manufactured from 15mm diameter aluminium or extruded PVC tube and available in a wide variety of lengths. All Barton tiller extensions feature our flexible joint which can easily be removed from the tiller when required. Aluminium extensions in 'Spectro' grey anodised material. Plastic extensions in heavy-duty, UV-stabilised grey PVC tube, manufactured especially for Barton. Both types available with either golf grip or plain button end options.