This vertical wall bed spring mechanism kit gives DIY Murphy bed builds the pull strength to fold a king or queen mattress up and down with one hand, fitting beds from 47 to 70 inches wide (1.2 to 1.8 meters). Nine heavy-duty springs work together inside the mechanism to counterbalance the mattress, so a single person can raise or lower the bed without straining, and a durable copper axis keeps the roll-in, roll-out motion smooth over time. The white hardware is built from iron and stainless steel rated for a 992-pound load capacity, resisting rust and holding up to daily folding without breaking down. Installation is a four-step process: separate the springs from the U-shaped buckle, mount the box plate and spring assembly, connect the two halves, then rotate the bed open and reinsert the buckle into the eyelet; spring count can be adjusted afterward to fine-tune tension. Folding the bed up also makes it easy to sweep or vacuum underneath. At 24.2 pounds, the mechanism suits lofts, studio apartments, and guest rooms where a spare bed needs to disappear when it's not hosting company.