I-125 - Twin/Full Standard Insta-Lock Bed Frame 1 1/4" side rail, 65" long sides, 4 legs with Plastic glides 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.