Loaʻa iā Plato nā mea hoʻohui ʻelua (nā kila drill hui pū) a me nā mea hoʻokele liʻiliʻi liʻiliʻi (nā lāʻau Taper drill a me Taper drill bits / Knock-off drill bits) no kāu koho ʻana no ka wili lua liʻiliʻi, ʻoi aku hoʻi no nā wili pōhaku paʻa lima. Ua kapa ʻia kēia mau mea hana he mau mea hana wili lima. ʻO ka wili ʻana me ia mau mea hana ʻo ia ke ʻano o ka wili ʻana rotary-percussive kahiko loa, a loaʻa iā lākou kahi noi ākea i ka quarrying, eli gula a me ke kūkulu ʻana a pēlā aku.
Welina mai i kāu nīnau
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