Pair - Titan Adjustable Motorcycle Wheel Chocks 17"-21" Tires Bike Trailer Mount Compatibility: Fits wheels that measure 17"-21" in diameter and less than 6.5" wide Safety: Mount to floor securely instead of bolting; Use kickstand or strap to bind it Includes: 2 motorcycle chock and mounting hardware Design: Solid, powder-coated, efficiently uses storage space; Easy for 1 person to mount and drive into Dimensions: Base - 15.4" x 10.3"; Total Weight: 36 lb