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Simply replace the punch
01：Friction Drill：Using a standard tool holder will reduce the service life of the drill and the spring collet
35° helix angle – reduces burrs
5：When the rigidity of the machine tool and workpiece installation is poor
BB 200mm Length Coated Carbide Drill Machine Metal Hole Making Tool for Steel Stainless Steel(4.0~20.0mm) JIN系列 Simply replace the punchBB 200mm Length Carbide Drill Designed for Deep Hole Machining: Powerful Cutting Performance, Durable and Rigid. BB2055 Series: TiSiN Coating, Suitable for Mild Steel Material Hardness: HRC < 40 Point Angle: 120 BB2055 TiSiN HRC < 40 120 Brand Name(): BB Origin(): Mainland China() is_customized(): YES Model Number(): BB2055 DIY Supplies(DIY): Metalworking Type(): Twist Drill Bit() Use(): Metal Drilling() Dia. of Cut: 4. 0mm 20. 0mm Precision Measured,