This combo kit is aimed at stylists and experienced at-home users who already sew in wefts, closures, or extensions by hand rather than gluing or clipping them in. It suits anyone who wants a matched needle-and-thread set on hand for weaving installs, rather than someone new to hair extensions who hasn't sewn a weft before.

It bundles the two things a hand-sewn weave or weft install actually requires — needles and thread — from a single brand, so you're not trying to match a needle gauge to a separate spool of thread bought elsewhere.

Thread one of the included needles with the weaving thread and knot the end. Use a curved needle to stitch along braided tracks close to the scalp, letting the curve follow the head's shape, and switch to the straight needle for direct, flat anchoring stitches such as at the nape or edges. Secure each section with a small knot before moving to the next track, and trim excess thread once the weft is fully sewn in.

Buying needles and thread together in one set saves a separate shopping trip, and having both curved and straight needle shapes on hand covers the different stitch angles a sew-in install typically needs, from following the curve of the head to anchoring flat sections.

On the downside, Kim & C doesn't publish exact thread yardage or needle gauge for this specific 4-piece set, so stylists doing back-to-back installs may still need backup thread on hand, and the kit assumes some hand-sewing experience rather than teaching technique from scratch.