HEL Solid Billet Bar Mounted Adjustable Rear Thumb BrakeHEL Solid Billet Bar Mounted Adjustable Rear Thumb Brake Description The HEL Performance bar mounted thumb brake features a large curved lever so that it fits you ergonomically. The larger blade surface area makes it easier to use with gloves on and easier to locate without looking down. The lever can be adjusted to alter starting position. The lever features pressed in bearings, something we will be looking to include on the standard master cylinders