Snap-Loc Wood Dolly Kit lets you build a custom-size dolly using 2” x 6” wood studs (not included) to fit your specific projects, with a reusable design that can be easily reconfigured. Choose your own casters to match your application, and add optional E-Track Singles with E-Track straps (sold separately) for load control and interconnection. Made in the USA from heavy-duty galvanized steel, this durable kit assembles quickly and adapts to a wide range of cargo needs. Base Kit Includes: 4 Brackets, 16 Bolts, 32 Screws.