The 90 Degree Tunnel with Mini Posts is an excellent play system activity which you can install anywhere on your playground that has proper surfacing. This plastic tunnel is big enough for preschool aged children to crawl through with ease. Unlike a straight crawl tunnel, kids can’t see right through this 90 Degree Tunnel, which makes it more exciting as they round the corner. The circular peek-a-boo holes along the sides let in light to keep the tunnel from being dark or scary. They also let children look around while they hide, while also making them easier to keep an eye on.