Optimill slimline boss fits directly to your steering column, without the need for multiple bosses to be used. Manufactured to the highest standard, hard anodised to prevent wear and designed to give an extra level of security to your vehicle. The slimline boss is just 42mm in depth, meaning it is only 10mm thicker than our original slimline boss. The boss is designed to fit Momo steering wheels or wheels with 6 holes on a 70mm PCD. Momo horn button will no longer be able to be used as the boss is so slim, therefore an Optimal cap is supplied along with screws and pins for installation. Note: This boss has 2 locking pins which are used to separate the boss. These must NEVER be pulled open whilst driving. This is designed as a removable product and it is the drivers responsibility to ensure it is fitted correctly and in full working order before attempting to drive the vehicle.