Bal Deluxe RV Tire Locking Chock
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, included, turns a drive nut, extending the chocks against the tires for locking and retracting the chucks for removal. Requires 2-1/2" clearance between tires. Opens to 10". Rust inhibitive coating.