In Drifting, the use of the handbrake is very important, both for initiation of a drift and for adjusting your line or extending a drift when you are sideways.
The sprung ratchet mechanism in a handbrake means that unless you depress the button on the end of the handbrake lever, when you pull the handbrake up, it locks on. Whilst this is great for parking, it can be a bit of a problem if you just wanted to give a little tweak of the rear brakes.
With spin turn knobs, you remove/disable the spring inside the handbrake so that when you pull the lever up, it simply falls back down when you let go. When you want to engage the ratchet on the handbrake for parking, you push the spin turn button forwards locking it in place.

These knobs have been specially made in the UK for Driftworks and we're very happy with the results.
These fit Toyota AE86 and Mazda RX7.