Double, all steel, railroad wheel chock with replaceable rail biting spurs. Type "B-1" for flush rail. Holds the railcar in both directions. Features heat-treated spurs for excellent rail-gripping power. Handle length is 12-inches. Weight is 12-pounds. Always use tarp strap (supplied with chock) to draw chocks against wheel. Replace strap if missing. Product of Aldon® Company.