10pcs PCB micro-carbide drill bit set Made of high speed steel, hardness and stable. The drill bits are lightweight, the appropriate size does not take up extra space, can be applied for handling wood, plastic, rubber, PVC, walnut, pattern, bone, angle, amber, olive, fiberglass and other materials. With its sharp edges, our state-of-the-art PCB spiral groove reduces cutting forces, improves hole accuracy, prevents bit damage, and improves drilling accuracy. Packed in plastic boxes to make it safe, clean, tidy and easy to find. It is easy to carry and protect the drill bit and take it to the workshop and other working points. PCB Drill BitMade of high speed steel, stable and durable ,can provide great convenience for cleaning your 3D printer nozzle. Sizeincludes 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0. 6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm head diameter. Easy to store and transport It is equipped with a blow-molded storage box high quality, and twist drills of all sizes have their own slots. Usage PCB mini bit can be used for plastic, fiberglass, steel, aluminum, copper and brass, titanium and jewelry.