Quartet Map Hook with Clips For 1 Inch Map Rails, Silver (XDH001) Map hook for use with Quartet 1 Inch Map Rails Easily attaches to map rail Sturdy bond between the map rail and the accessory Add to and enhance your markerboard and map rail Designed specifically for use with Quartet XDR1144, XDR1096 and XDR1072 one Inch map rails (rails sold separately)