Turn any hook into an inverted jig hook with these tungsten inverting tungsten beads. Because the weight is offset, hooks invert during the drift. I've had very good success using these beads on straight shank nymph hooks. They reliably turn the fly upside down which reduces snags and leads to more fish being hooked securely in the upper jaw. They also are heavier than equivalent sizes of slotted or countersunk tungsten beads because less of the bead is removed to accommodate the hook.
See the hook and bead chart in the product photos for information on matching hook size and bead mass.
The process for attaching them is:
Slide the bead onto the hook with the concave (recessed) side facing to the rear of the hook. Leave a gap between the hook eye and the bead.
Put a drop of superglue in front of the bead.
Invert the hook and slide the lead wire and bead forward. Jam the lead wire into the recess and the superglue will hold the wire and bead in place.