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please do not continue to use it if there are [Collapse mouth/cracks] during use to prevent safety hazards and damage to the drilling material
BB Internal cooling drill
3 D4 6 50 3T 2R0
Multi-layer coating to improve the high temperature resistance of the drill body
BB Micro Drill Bit Shank D=4mm BF2055 thread milling cutter please do not continue toBB Mirco Drill 1PCS The whole bit is made of Solid Carbide, which makes the bit more durable. But it also makes it easier to break, so it's forbidden to use electric hand drills and unstable machining environments. Application Steel, stainless steel, cast iron, die steel, circuit board,acrylic and so on. Diameter of shank : 3mm or 4mm Recommended Cutting Conditions *Reference parameters are used as the general standard and need to be adjusted