SmartClip: New and improved end clip mechanism, now with a "Click in Place" feature and signal coloured area indicating when the clip is open. Features - Closed: Secure hold of rubber during work. Simply pull the rubber to adjust the tension. - Open: Change rubber or adjust rubber tension. - High-Tech-T6-Aluminium: Lightweight and durable extruded Aircraft Aluminum channel does not bend, ensuring perfect pressure distribution for streak free cleaning. Ninja star markings for easy center positioning.