The Vitavia Cropped Head Nuts And Bolts are supplied as a pack of 10, made from Anodised Aluminium to prevent corrosion and are ideal tools to be used in greenhouses. These cropped fixings are designed to fit into the aluminium channels once the frame has been assembled or fitted into a ready built greenhouse. The shaped heads just twist and lock into the channels which allows you to position and move accessory fittings around and can also be used for repair should you need to replace a square head bolt. This product is only compatible with Vitavia greenhouses.