The Snap-Loc Wood Dolly E-Track Connector Strap connects multiple dollies together with some flexibility 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: Straps connect dollies together in any direction to build any size platform to perfectly fit larger loads. Can connect 4 or more Dolly to make larger platforms. 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 Flexible Strap 2″x7″ wide. SLWKSCS: 1 Connector Strap, 2 Singles, 8 Screws.