WORKPRO 13-Piece Spade Drill Bit Set, 1/4" to 1-1/2", Black

Used for accurate holing on such precious material as pearls, turquoise,beeswax, amber, jade, crastal, bodhi, and ornaments components such as gold, silver and copper, And twist needle is equipped by default, if you meed punching jade, pls get 0.5-3.5mm tungsten steel drill bit.