YSTD&reg; DIY 10Pcs PCB Print Circuit Board Carbide Micro Drill Bits Tool (1.1mm-2.0 mm) This micro twist drill bits set is made of Tungsten Steel (Drill Bit tip) and high speed steel (grip Application: All kind of industrial and mechanical purposes Specification: 0.1-1.0mm (0.1mm ,0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm) 1.1-2.0mm (1.1mm ,1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm) Quantity: 1 set(10pcs)