Oxford LidLock OX623 Combination Carabiner Helmet Lock.
Set your own 4 digit combination and secure your helmet, jacket or gear to your bike. This aluminum Carabiner lock is useful not only for motorcycle helmets but bicycle or other sport or travel gear as well.
A metal helmet extender is included to use through a helmet D ring and the coiled plastic cable (yes it has steel cable inside) can be used to secure all kinds of clothing.
Obviously, a lock like this is designed only to prevent quick opportunity walk-off theft.
Carabiner Dimensions: 10mm (3/8") x 105mm (4-1/8") long x 70mm (2-3/4") wide.
Extender T-bar Dimensions: 4mm (1/8") thick x 110mm (4-1/4") long x 20mm (3/4") wide - T is 40mm (1.5") wide
Plastic covered Coiled Cable: Extends to 3ft.