An anti-climb device comprising a protective strip 401, 402 with a base panel and an array of plastic spikes extending upwardly from the base panel. The spikes 403, 501 comprise a plurality of bosses of two different heights. The bosses may be conically shaped and may be hollow with a base end open to the reverse face of the base panel. The spikes may be laid out in a diagonal pattern or alternate rows. The device may be bendable along two axes. The base panel may define a plurality of fixing apertures 502. The device may slidably engage with another device via mating flanges with a series of locking ribs on one flange and corresponding slots on the other. The device may have a skirt or collar for receiving adhesive. Also claimed is a system comprising a plurality of said devices connected together via a jointing strip or connecting bridge.
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