After evaluating several seemingly identical knife sharpening sandpaper holders from different manufacturers, I selected this specific one. This is because it was the only one that addressed my primary concern with sanding racks of this type, that the clamps on each side must be able to clamp evenly throughout the entire width of the sandpaper and stretch it taught.
Wavy sandpapers can ruin bevel geometry faster than my dog could steal food from me.
