Today magnetic discs are the most common way of placing discs in the grinder/polisher.

Aka-Rhaco is a adapter disc with a adhesive surface. This allows the use of standard non psa grinding paper, saving almost 40% in cost in comparison to psa backed grinding paper.

Aka-Rhaco is available for magnetic discs in all common sizes, but also as a self adhesive version in 230 mm (9″) especially made for the old 2 disc Knuth-Rotor grinders.