M5 (Hex Screwdriver key = 4mm) , M6 (Hex Screwdriver key = 5mm) und M8 (Hex Screwdriver key = 6 mm) .

Antitheft for all bicycle components that are fastened with hexagon socket screws.
The Pit-stoppers prevent unauthorized unscrewing. They can be only removed with the special screw
The Allen-openings remain intact.
variations: available for hexagon socket-openings (SW) of size M5, M6 and M8.