JENDYK UNIVERSAL FIT AIR BRAKE TRUCK LOCK, SINGLE KNOB, KEYED DIFFERENTLY AIR BRAKE LOCK IS FOR MEDIUM DUTY TRUCKS, BUSES, MOTOR COACHES AND RV’S WITH ONE KNOB. THE AIR BRAKE LOCK IS DESIGNED TO FIT ALMOST ALL TRUCK LOCKS, INCLUDING THOSE WITH CURVED DASH BOARDS AND OVERSIZED KNOBS. REDUCES RISK OF THEFT WHEN ON THE ROAD OR WHEN IN THE TRUCK YARD. GREAT FOR DRIVERS, TRUCK DEALERS, REPAIR SHOPS AND MECHANICS.