Caterpillar Tunnels are designed for professional Market Gardeners. These easy to construct tunnels can be put up in 2 hours by 2-3 familiar people. Designed to be cheaper than permanent tunnels, and portable to suit your crop rotations. We offer a full range of spare clamps, clips and fastenings for Caterpillar Polytunnels. These include specialist clamps and basic fixings & fastenings.