For in-bed support that’s secure and easy to install, nothing compares to the Assista-Rail. Simply install it between your mattress and box spring for a solid bed rail. The safety strap (supplied) ensures that the Assista-Rail is not going to budge. Rail (grip) Diameter: 1.25” Rail Width: 17.25” Rail Height: 20” Material: Alloy steel Finish: Anti-microbial white powder coat Weight Capacity: 300lbs Install Yourself