24 Long * Can Be Used With Either Standard Arm Or Desk Arm Wheelchairs * Double Notches Allow The Board To Be Used On Either The Right Side Or Left Side Of The Wheelchair * Constructed Of Plywood And Finished With A Smooth Lacquered Finish * The 24 Board Has One Built-in Handle While The 29 Board Has Two Built In Handles * Thickness * Notch Designed To Fit Into Up-right Of Wheelchair Arm For Added Security During Transfer * Supports Up To 300 Lbs *