Conical shaped plastic stopper for roller shutters with invisible rust-proof M5 screw and outer washer. Prevents the roller shutter from getting stuck in the box. Quick and easy installation without special tools. Specifications: Length: 40 mm. Materials: Polypropylene (PVC). White colour. Weather resistant and highly durable. Easy to install: Installs on the final slat of the shutter by placing one unit on each side and fixing them using the central screw. They must be oriented towards the outside of the shutter. They will serve as stops to prevent the shutter from coming out of the rails when rolling it up or raising it. Commitment: With nearly 10,000 products in its catalog, has been manufacturing and distributing for over 80 years products for locksmithing, DIY, hardware, ironwork, gardening, household equipment, electricity, professional line and safety and work protection. All of them are of the highest quality and reliability.