These are our new Mini air brake/parking brake lockout blocks that protect our RV's from an accidental rollaway if the knob is accidently hit/pushed by our kiddos or pets. They simply slide under the knob/lever, click and lock. When purchasing just tell us what color you'd like and we'll ship them right out to you. These measure L 1.8 X W 1.693 X H .697. Secure your brakes, secure your peace of mind.
