Glideaway 21RR - Twin - Full Bed Frame with Rug Rollers 4 Legs The Glideaway 21RR bedframe adjusts to be used with a Twin or Full sized mattress. Special Rug Rollers provide safe and easy movement over carpeted or hard floor surfaces Longer side rails and cross arms provide more support and greater protection for bedding. No tools required for assembly - Simply set it up right out of the box. 4 Legs with special rug rollers provide safe movement capabilities