I-495SS6 - Twin/Full/Queen Deluxe Insta-Lock Bed Frame 1 1/2" side rail, 70" long sides, center cross rail, 6 legs with Wide rug rollers, 2 with brakes Constructed from recycled railroad steel, the Mantua Insta-lock Series is strong and durable. The Insta-Lock design makes adjusting the frame easy, providing the box spring with a secure and stable fit. Because no tools are needed for assembly, setup is quick and easy. Made in the USA. Instruction Manual