带导向柱锥柄平底锪钻 Taper shank flat countersink drill with guide pole

带导向柱直柄平底锪钻 Straight shank flat countersink drill with guide pole Countersink drill series

锥柄麻花钻 Taper-shank fluted twist drill

锥柄加长麻花钻 Taper-shank lengthened fluted twist drill