Caadi ahaan waxaa jira saddex nooc oo PDC ah (polycrystalline diamond compacts): sida wax riixida, shucaaca radial, iyo qaadis isku dhafan. Qaadashada PDC waxay lagama maarmaan u tahay bay'ada qallafsan, kaas oo lagu dabaqo layliyo turbo, matoorada dhoobada, bambooyin koronto ah, RSS (nidaamka isteerinka rotary), hawlaha goobta saliidda, iwm.
