Ua ʻike ʻia nā ʻāpana hollow drill ma ke ʻano he core drill bits, hole openers, center drill bits, steel plate drill bits, magnetic drill bits, rail drill bits, etc.
ʻO nā mea nui o ka drill bits: ke kila kiʻekiʻe;pauda metallurgy;carbide sima.
Loaʻa i nā ʻāpana hollow drill nā ʻano a me nā kikoʻī piha a kūpono i nā ʻano like ʻole o nā mea hoʻoheheʻe noho magnetic i lawe ʻia mai (magnetic drills) a me nā mīkini wili maʻamau, nā mīkini wili, nā mīkini ʻoluʻolu, a me nā mea ʻē aʻe. drill, a he 8 a 10 ka nui o ka pono o ka wili ana i ko na bit drill ma'amau.