Sanding paper holder

I needed a simple holder for sanding the staircase handrail. Looking through other models but didn't find any that will fit my needs, so i created one. Holder is for sanding paper roll of width 115 mm. Lenght for good grip is about 170-175 mm. Holes are intentionaly a bit tight so screw holds in place.   For completation you will need two M6x30 screws, two M6 nut washer a and two M6 wing nuts.