The Sure&Secure Bedrail is an essential item for transitioning your child from a crib to a bed. The bedrail fits twin to queen size mattresses and is easy to assemble. Accommodates twin to queen sized mattresses and platform beds Each panel measures 42L x 19H Meets current ASTM F2085 bedrail standards Minimal assembly required Summer Infant, an award winning industry leader in developing infant and toddler products offers families safe and innovative solutions that provide peace of mind.