This item is a set of 10pcs professional and practical drill bit. Cutting diameter all are 0.8mm. Industrial grade tungsten steel for higher durability. Suitable for drilling in tough material, including aluminium, cast iron, brass, copper, magnesium alloy, plastics, etc. for DIY, home, general building and engineering use. Features - - Material: Cemented carbide. - Diameter: 3.175mm. - Cutting Diameter: 0.8mm. - Overall Length: About 38.1mm. - Quantity: 1 set (10pcs). R: 0.1mm Length: 1.8mm; R: 0.15mm Length: 2.7mm; R: 0.2mm Length: 3.5mm; R: 0.25mm/0.275/0.3 Length: 4.5mm; R: 0.35mm Length: 5.5mm; R: 0.45/0.5/0.55mm Length: 7mm; R: 0.6-1.2mm Length: 8-10mm. - Without sticking, smokeless, odorless and silent during processing. - Use of ultra-fine grain carbide material with good milling, cutting performance, ensure high work efficiency. - Have sufficient bending strength and wear resistance; High hardness, high wear resistance, high strength. - cutting edge, milling, hole and plate edge, surface clean, neat, no . - Perfect in PCB, , CNC, Mould, plastic fiber, carbon fiber, super hard wood, printed circuit board, other precision parts processing. Package list: 2 x 10Pcs of 0.8mm PCB Carbide Drill Bits Micro Engraving Drill Set for Circuit Board