Enwere ike kewaa ezé diamond mejupụtara (DEC) n'ime: ezé conical nke diamond mejupụtara, ezé okirikiri diamond, ezé okirikiri nke nwere diamond, ezé ovoid mejupụtara diamond, ezé diamond mejupụtara wedge, diamond composite flat top ezé n'ihe gbasara ọdịdị na ọrụ. wdg.
A na-eji ya eme ihe n'ọtụtụ ebe na ngwuputa injinia na ogige ihe owuwu dị ka ibe n'ibe rola cone, ibe n'obere oghere, ngwa injinia na-egwuputa ihe, na igwe na-etipịa ihe. N'otu oge ahụ, a na-eji ọnụ ọgụgụ buru ibu nke akụkụ ọrụ kpọmkwem nke PDC bit, dị ka ezé na-adọrọ adọrọ, ezé etiti, ezé nha, wdg.