The BAL 28005 Deluxe Tire Chock is a product that is designed to prevent trailer rolling. It is a scissors type locking chock that extends from 2-1/2" to 10". The chock has a rust inhibitive coating and is designed to fit between tandem tires. It locks wheels by applying force to both tires and helps to stabilize the trailer and prevent tire shifts. The product comes with a hand-operated plated ratchet wrench (Model 841025) that is used to tighten the chock in place.