Bell HCB HP10/MAG-10 Rally Screw Set

Bell HCB HP10/MAG-10 Rally Screw Set

This Bell accessory secures the half chin bar, known as HCB, on open helmets. The bar can be released by hand, without a spanner or screwdriver. In an emergency this gives a doctor or rescue crew immediate access to the driver. The set fits Bell helmets from the HP10 and Mag 10 families, specifically the HP10 Rally, Mag 10 Rally Carbon and Mag 10 Pro.

The main part is a red screw with a round, flat head and a short threaded shank. A flat tab is set into the head. At rest it lies flush with the head, and when raised it forms an upright grip that allows the screw to be turned with the fingers. White markings with a rotation arrow on the head indicate the unscrewing direction. A flat black plate with angled sides and two chamfered mounting holes completes the set.

Once installed, the red screw sits on the side of the chin bar near its lower edge, while the black plate rests against the rear edge of the bar. The contrasting red head makes the release point easy to locate. Fitting and removal are straightforward: lifting the tab and unscrewing by hand frees the chin bar.

The set suits drivers and co-drivers who use an open-face Bell HP10 Rally, Mag 10 Rally Carbon or Mag 10 Pro helmet with a half chin bar, as well as service crews checking that helmet equipment is complete before a rally. When fitting, the tab should remain accessible from the outside, so that medical staff on a stage can remove the chin bar without looking for tools.