Snap on original tool box tray. Plastic construction heavy duty. I think this was for a KRL series box. Not sure. Has a lips on ends to sit onto of a metal edge of your box top or drawer. Look closely at pics for a proper fit. Dimension. 30 3/4 x 8 1/2 across top face and lip. Depth 1 1/2 Length across bottom is 30” minus the lip on each side.