1, Taper tap for oil drilling 2, special fishing tool 3, fishing by thread making in the inner bores of the little fishes Taper tap for oil drillingTAPER TAP (die tap / pin tap) is a special tool for cutting thread and fishing internally in dropped objects such as oil tube, drill-pipe, packer, water distributor, and etc. Particularly to fishing some tubes with hoop. Taper Tap For Oil Drilling