[Metric drill bits set] 1.5mm 2mm 2.5mm 3mm 3.2mm 3.5mm 4mm 4.5mm 4.8mm 5mm 5.5mm 6mm 6.5mm A total of 13 drills of different diameters, suitable for home handicraft scenes and professional work Small sizes require attention to speed and temperature. [Hexagonal drill shank] The 1/4 universal hexagonal drill shank can be quickly installed and removed. [Cobalt drill bits Widely applicable] Cobalt drill bits for by are suitable for stainless steel, carbon, steel, cast iron, engineering steel, hard metals, copper, aluminum soft metals wood suitable for home handicraft scenes and professional work. [Good Performance] 13 5% Spiral Double Edge Cutting Corners Do Not Linger on the , but Advance in a Predetermined Direction. [Dimensional identification strips] Each storage bit is clearly dimensionally identified Easy to store and access., Manufacturer: Littimoon