50pcs micro engraving drill bit in one set. Multiple sizes included in one set to meet different needs. Made of tungsten carbide (tungsten steel) with high hardness, strong wear resistance, not easy to bend and break. Resistance to small chip removal, smooth to remove chips and drills. A higher edge can reduce the cutting force and improve the drilling quality. Strictly symmetrical cutting edge can ensure high efficient operation and avoid drilling gap. Can be applied to PCB, SMT, molds, computer hardware, electronics industry, etc. Product description Features: Material: Tungsten Steel + HSS Item type: 0.5 + 0.6 + 0.7 + 0.8 + 0.9mm / 0.25 + 0.3 + 0.35 + 0.4 + 0.45mm (optional) Handle diameter: 3.175mm Quantity: 50pcs Package size: 10 * 7.5 * 5cm / 3.94 * 2.95 * 1.97in Package weight: 161g / 5.68oz Package list: 50 * Micro Drill Bits
