Compact Boom Barrier For Narrow Entrances & ExitsWhen a small boom barrier is all you need then this compact junior boom barrier is just what you need. Featuring a small gas damper and a compact counterweight this boom barrier has a smooth operated action. It can be locked in both the open and closed positions. The compact size of this barrier makes it the perfect companion for narrow drives, car parks and building sites. The short nature of this barrier means that it does not need a support post.