Optional types: 50PCS (1mm, 0.5mm, 2mm, 2.5mm, 3mm), 60PCS (1mm, 0.5mm, 2mm, 2.5mm, 3mm, 3.2mm). For for Durable Construction: Crafted from high-speed steel (HSS) and coated with gold, our drill bits are designed for exceptional resistance and longevity, they outperform standard options available on the market.
eBay