Tip: This needle only can be reaming, not drilling! Use: It can be used for hole enlarging of cultural relics, beads, pearls, crystals and jades. ●Material: Diamond Needle+ABS Plastic Handle ●Specifications: 0.8-3mm, total length 123mm, reaming hole diameter 0.8-3mm; 0.6-1.6mm, total length 108mm, reaming hole diameter 0.6-1.6mm.