Emkhakheni wokubhola uwoyela negesi, ukukhetha kokubhola kudlala indima ebalulekile ekusebenzeni nasekuphumeleleni. Ithuluzi elilodwa elibalulekile yi-8 1/2 intshi tricone bit. Lolu hlobo lwe-bit lwenzelwe ngokukhethekile ukusetshenziswa ezindaweni ezahlukahlukene zamadwala futhi luhlonishwa kakhulu ngokusebenza kwawo okuhlukahlukene nokusebenza kwawo emisebenzini yokubhola. I-tricone bit inama-cones amathathu ajikelezayo, i-eq