【Long Metal Drill Bit Kit】There are 8 kinds of diameters, 4 4.2 4.5 5 5.2 6 8 10mm, holes of different sizes to meet your needs【High Quality Metal Drill Bits】High quality material, steel high speed HSS 4241, full milling process, lengthened, total length 200 mm【Qlouni Long Metal Drill Bit】Precise positioning, fast cutting, strong chip removal, good wear resistance, etc.【Wood Drill Bit】long wood drill bit, Suitable to steel castings, spring steel, white steel, I-beam, ordinary steel, angle iron, aluminum, copper, wood and stainless steel 1-4mm, etc., drilling of various materials【Purchase Service】Once you you buy our 8cps extra long drill bit sets if you are not satisfied or damaged when you receive the product, please contact us, there is no reason for a full refund or a new one! Never regret buying our productsSpecificationMaterial: High Speed SteelDiameter: 4mm, 4.2mm, 4.5mm, 5mm, 5.2mm, 6mm, 8mm, 10mm Length: Approx. 200mmQuality: 8 pieces