This B&M shift knob has a 12-volt momentary switch which can be used to activate a trans-brake, launch control, nitrous oxide, or two-step ignition control. Fits all B&M shifters with a threaded shift stick and comes with numerous sized adapters to fit various other shift sticks or shifters. SAE thread adapters fit 1/2-20, 3/8-24, 3/8-16, and 5/16-18 threads and work with 12-volt and 16-volt systems.
 

Features:
Works With 12 or 16-volt Systems
Can Activate a Nitrous Oxide System
Comes with Numerous Adapters
Can Activate a Two-step Box
Can Activate a Roll Control