These are aluminum side board trays / slider mounts for the scx24, These mount where the skid plate mounts. They come with some hardware you may or may not need or may need in the future when mounting sliders to the tray if so desired. These make a great spot to mount electronics, Or batteries, Or whatever else you can think of. If mounted on a Chassis with an angled skid plate the trays will look angled while the vehicle is flat most likely.