Urukurikirane: Impamvu Uduce tw'Imashini zo Gucukura Tunanirwa | Ingingo ya 10 Amagambo ahinnye: inguni ya drill bit point, 118 vs 135 drill bit, drill bit split point, HSS drill bit, ubuyobozi bwo guhitamo drill bit Iyo utonze ibibazo bihagije byo gucukura bit, ubona igishushanyo. Abaguzi babaza inguni ya point "iruta" ...