Ultra-Fab 21-001070 Ultra Deluxe Chock & Lock - 2 Pack Easy to use, one piece stabilizer chock collapses to just 1.5" Unique design eliminates front-to-back rocking motion Works by anchoring the opposing wheels of tandem axle trailers and fifth wheels. Lockable to prevent theft (padlock not included) E-Z grip handle creates better leverage Easy to use, one piece stabilizer chock collapses to just 1.5 inch Unique design eliminates front-to-back rocking motion