3" ʻo ka disc grinding he mea kūpono loa no ka wili ʻana i nā papa lepo a me nā terrazzo. He maʻalahi ke hoʻololi a ʻaʻole lele maʻalahi i ka wā e wili ana. Hiki i ka pōʻai ma luna o ka ʻaoʻao ke holoi pono i ka lehelehe o ka papahele a hoʻemi nui i nā ʻōpala ma ka papahele. He 6 mau ʻāpana( 7.5mm kiʻekiʻe) a paʻa loa.