Daiichi 4647 Jig Hook Black Nickel 25 Pack. The Daiichi 4647 Jig Hook is used for tying European Jig Style Nymphs. Unlike many jig hook models for tying trout nymphs, the Daiichi 4647 has a barb. When tying European jig nymphs on jig hooks it is best to use slotted tungsten beads rather than traditional countersunk tungsten beads. The larger sizes of the 4657 are perfect for tying balance leech patterns.