Sida laga soo xigtay biraha kala duwan ee dhulka la dhigo, iyo qalabka kala duwan ee loo isticmaalo, dooro xargaha kala duwan iyo saldhigyada maro si loo gaaro waxtarka ugu fiican.
Suunka cammuudda ikhtiyaariga ah ee hadhuudh xoqan oo kala duwan:
Brown oo isku qasan alumina,
Silikoon carbide,
Abrasives-ka la kariyey,
Zirconia aluminium,
Abrasives dhoobada,
Abrasives raasamaal.