Ua māhele ʻia i ʻekolu mau māhele: coarse, medium a me detailed. He ʻulaʻula ʻeleʻele ka ʻupena coarse, he ʻulaʻula māmā ka ʻupena waena, a he ʻulaʻula a keʻokeʻo ka ʻupena maikaʻi. He like ka nui o ka palaoa o kēlā me kēia ʻupena, a he like ke ʻano o ka palaoa. Ua kapa ʻia ʻo ia he kristal angular me nā ʻaoʻao ʻoi a me ka ikaika wili kiʻekiʻe.

No ka wili ʻana i ke kinikini a me nā mea palupalu ʻē aʻe i ka ʻoihana pōhaku.

Wili ka ʻoihana aniani i nā ʻūpā aniani, nā paipu kiʻi kīwī, nā mea hana maka, nā aniani, nā prism, ke aniani uaki, a me nā mea ʻē aʻe.

ʻO ka hoʻoheheʻe ʻana i ka ʻōpala metala, ka wili ʻana, ka wili ʻana. Wili ka ʻoihana paʻi i ka papa offset, a hana ka ʻoihana māmā i ka hāpana palakiko, ka ʻili, ka pepa one a me nā mea ʻē aʻe.

ʻOi aku ka haʻahaʻa o ka ikaika wili o ka corundum kūlohelohe ma mua o ka corundum keʻokeʻo umu uila, akā ikaika kona paʻakikī, a he ʻano like me ka ʻāpana pūpū. ʻO kona mau pono he laumania kiʻekiʻe o nā ʻāpana wili, emi a pāpaʻu nā māka one. He maikaʻi a like ka ʻili wili, hiki ke hoʻomaikaʻi i ka maikaʻi o ka huahana, ʻo ia ka hiʻohiʻona kū hoʻokahi o kēia huahana. He pōkole ka manawa wili o ka emery kūlohelohe, kiʻekiʻe ka pono a me ke kumukūʻai haʻahaʻa, hiki ke hoʻopiha no ka nele o ke ola lawelawe pōkole.