490mm. Fix on top of walls, gates and fences to deter intruders and unwanted pests. Triple row of tough polypropylene pointed cones at varied height for maximum discomfort. UV weather resistant. Fix with nails, screws or adhesive. Each strip can be snapped at intervals for neat fitment. Property owners must be satisfied that no harm will be caused by this product. The supplied clear warning sign must be displayed, advertising that an anti-intruder device has been fitted to the property.