Product Specifications Material Heavy duty steel (1" tubular) Color Black Weight 13 lbs. Height 7.5" to 15.5" # of rails 2 # of legs 4 (2 for each rail) Bedframe Sizes Full, Queen, King (Recommended 2 units), California King (Recommended 2 units) Installation Materials Everything included except screwdriver Manufacturing Location USA Instructions Included Yes Universal Bed Supports - Made in USA Front view High quality heavy duty steel made in USA. Isometric view Adjusts easily to fit full, queen, king, and California king frame sizes. Adjustable height and width. Queen bed isometric view (bed not included) Example of supports on queen size bedframe (bed not included). Queen bed side view (bed not included) Example of supports on queen size bedframe (bed not included). Universal Bed Support System is a heavy duty, USA made, adjustable steel bed slat support system that fits between the side rails of your bed. It allows your box spring and mattress to sit on a solid foundation and relieves a lot of the weight that normally is placed on the side rails. These heavy gauge steel bed slats incorporate two adjustable feet on each bed slat giving you a total of four feet supporting your box springs and mattress. Each support system comes with all necessary mounting hardware and installation instructions (with the exception of the phillips head screwdriver). Universal Bed Support System is a heavy duty, USA made, adjustable steel bed slat support system that fits between the side rails of your bed. It allows your box spring and mattress to sit on a solid foundation and relieves a lot of the weight that normally is placed on the side rails. These heavy gauge steel bed slats incorporate two adjustable feet on each bed slat giving you a total of four feet supporting your box springs and mattress. Each support system comes with all necessary mounting hardware and installation instructions (with the exception of the phillips head screwdriver).