The innovative bed frame designed by Sleep Revolution is more than just “compact” and easy to set-up, the construction is uniquely designed for durability and optimum support for any mattress set. The center bar support and 9-leg construction on the queen-size frame are unique to the Compact Bed Frame providing stability and support. The bed frame is designed with two-wheels for ease of mobility – simply lift and roll. The wheels lock to keep frame in place. Each support bar features a quick lock system. The 9 support legs simply fold out when assembling and are slightly recessed for safety and help prevent hitting your toes when making the bed. The product packaging allows for convenient FedEx/UPS shipping. This bed frame is a no-tools assembly frame.