Petzl® Set Caterpillar is an articulated protector with rollers that guides a moving rope and protects it from abrasion. The vertical and horizontal rollers guide the moving rope with a minimum of rubbing. Each module can be positioned independently to adapt to the terrain. Modules are connected with quick links and the number of modules can be varied according to the terrain. Set Caterpillar is sold as a kit with 4 modules, 6 quick links and a carry bag.