Oak beaded rail with a turned beech roller on spigots for easy rolling. A utility classic from the olden days, as good as it ever was and available with or without continous linen and cotton roller towels.
 
Instruction: Use fixings suitable for your wall. Position fixings on a hoizontal line, matching up to keyhole centres and protuding 10mm approx. Slot keyholes over fixings to check fit. Remove and add quarter turn on each screw until secure.