The Snap-Loc Wood Dolly E-Track Connector Bar connects multiple dollies together rigidly in any direction making it the easiest, fastest and safest way to move larger bulky items in less time! THE PROBLEM: Cheap dollies have junky casters that don’t roll well, break often causing valuable items to dangerously fall and waste your time and money. THE SOLUTION: The Snap-Loc Wood Dolly has high capacity smooth rolling casters, is USA made to last a lifetime, offers optional E-Track Strap cargo anchoring to move everything with ease! You’re going to love it! Wood Dolly System also coordinates with the Snap-Loc E-Track Single System to secure cargo and items on pickups, trucks, trailers, racks, walls, floors, ceilings and more! CUSTOMIZABLE TO ANY SIZE: For use with the Snap-Loc Wood Dolly System giving your custom Dolly ability to connect endlessly in any direction. INCREASES DOLLY SIZE: Bars lock dollies together in any direction to build any size platform to perfectly fit larger loads. VERSATILE SOLUTIONS: Also available are E-Track Strap Kits for securing and handling loads, Carpet Pads, Rubber Pads, directional Caster Steering Kits, and more. SPECIFICATIONS: Zinc E-Track Single 1″ x 5-3/4″ x 1/2″ holes 5″ O.C. and zinc plated Bar 1-1/4 x 7-3/8 x 1-1/8″ tall. SLWKSCB: 2 Connector Bars, 2 Singles, 1 Link, 8 Screws.