Product Description An ingenious invention: the PIT Stopper by Pitlock Anti-theft device for all bicycle components that are fastened with hex bolts. Pit Stoppers prevent unauthorised unscrewing. The Pit Stoppers can only be removed with a special screw (an unlocking aid). Hex openings remain intact. Models:Available for hex openings (SW = width across flats) of size: M5 Width across flats: 4 mm M6 Width across flats: 5 mm M8 Width across flats: 6 mm Contents:2 x s1 x Pitlock unlocking aid Manufacturer: Pitlock Wittestr. 3-5 Haus F 13509 Berlin Germany info@pitlock.com