Also known as a 'drift button' this knob replaces the factory handbrake knob and allows for free action of the handbrake. You can still use the handbrake by pulling the lever in to place and pushing up on the knob to lock it there.
The Drift Knob installs in the e-brake to eliminate the need to press the button in order to release the lever. Also features a larger surface area for more precise use during drifting.