1. ʻAno convex alo: ua māhele ʻia kēia drill bit i ʻelua mau ʻano, hoʻokahi haku a me ʻelua luna maka hope, hoʻohana nui ʻia ka hope no ka drill bit me ke anawaena nui.Hiki i ka maka convex drill bit ke mālama i ka wili kiʻekiʻe i ka wā e wili ai i ka pōhaku abrasive paʻakikī.Eia nō naʻe, ʻaʻole maikaʻi ka pololei o ka wili ʻana, ʻaʻole kūpono no ka ʻenekinia wili me nā koi kiʻekiʻe o ka pololei o ka lua.
2. ʻAno mokulele alo: ʻano lōʻihi kēia ʻano drill bit, kūpono no ka wili ʻana i ka pōhaku paʻakikī a paʻakikī loa, a kūpono hoʻi no ka pōhaku paʻa paʻa a me ka pōhaku palupalu me nā koi haʻahaʻa pololei no ka wili ʻana a me ka lua ʻana.
3. ʻAno maka concave: aia kahi ʻāpana conical ma ka ʻaoʻao hope o ke poʻo drill i kēia ʻano.He wahi liʻiliʻi ia e hana i kahi hopena nucleation liʻiliʻi i ka wā wili e mālama i ka hana alignment o ka bit.He pololei maikaʻi ka lua wili.Loaʻa i ka drill bit ka hopena hoʻopuka pauda maikaʻi a me ka wikiwiki o ka hoʻoheheʻe ʻana, ʻo ia ka bit drilling bit e hoʻohana hou aku ai i ka mākeke.
4.Deep concave kikowaena 'ano: keia 'ano o ka bit ua evolved mai ka ia ano o ka poepoe bit, a me ka waena konu o ka hope maka o ka bit i ka hohonu concave kikowaena.Hoʻohana ʻia ia no ka nucleation i ke kaʻina wili.I ka ʻeli ʻana i nā lua hohonu, ʻoiaʻiʻo ka pololei o nā lua, a kūpono wale ia no ka ʻeli ʻana i ka pōhaku palupalu a me ka pōhaku paʻakikī waena.
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