BAL X-Chock Tire Locking Chock starts off where the Deluxe Tire Locking Chock left off but it's new, slimmer design will fit into more axle applications. It fits between tandem tires, it locks wheels by applying force to both tires. Aids in trailer stabilizing and prevents tire shifts. A hand-operated plated ratchet wrench turns a drive nut, extending the chocks against the tires for locking and retracting the chucks for removal. Provides added stabilization and prevents tire shifts by applying opposing force to tandem, tire applications. As opposed to other chocks, the X-Chock works with the tires natural movement instead of against them. Fits even the tightest of applications retracting down to 1 3/8-inch and extends to 10-inch. Rust inhibitive coating. Plated ratchet wrench with comfort bumper included. Lightweight, easy to store. Lockable for added security with optional 28015 Pad Lock. Made in the USA.