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PCB Hand Held Drill Machine is used to drill holes in PCBs. This drill is a spiral type drill. A Small Hand Drill which Is operated by depressing the body of the Drill Downwards. Generally used for PCB drilling and all small drilling in the range of 0 – 3 mm.It comes with 2 collets, which enables it to be used with bits of sizes 0 – 3 mm.This drill is perfect for making PCBs at home.0.3-1.6mm Shank Twist Drill Bits Precision Drill Bits (Micro HSS 20PC Drill Bits)Mini Twist Drill Bit Kit Made of high-speed steel, excellent workmanship, stable and durable. Micro Mini Twist Drills Bits, made of high-speed steel, durable and sharp, small drilling resistance, chip removal smoothly. Multiple Sizes The HSS micro drill bit with 20 different sizes(0.3mm-1.6mm) can meet your various needs in daily work.Come with a specially designed box, twist drills in every size have their own slot, keeps bits securely in place, and dispenses on drill bits at a time.0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm.Please Note: This mini drill bits set Not suitable for processing steel, iron, stone, and other hard things.