Ƙirƙirar wani nau'i mai mahimmanci na wannan jumla Cibiyar drill bits suna yawo kamar sauƙi kamar kowane abu a cikin kayan aikin hannu.
Tabbas, wani nau'i mai rikitarwa na jumla shine "Center drill bits yawo kamar sauƙi kamar kowane abu a cikin kayan aikin lantarki na hannu - don haka don irin waɗannan ayyukan, ana amfani da punch na tsakiya don gano cibiyar rami da aka tsara kafin yin rami na gwaji. "