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General drill bit is more suitable for plane drilling
Geometry: Ball T-shape (upper and lower arc support)
they are suitable for small-scale roughing and the machining of less complex workpieces
5 D4 12 100 4T 4R1 D4 10 50 4T 4R1 D4 12 75 4T 4R1 D4 12 100 4T 4R1
BB 50mm Lenghth 3xD Carbide Drill External Coolant Efficient CNC Drilling Tool BB2055(0.3~4.0mm) left hand reamer General drill bit is moreBB 3xD Solid Carbide Drill Please note that there are two types of drill bits: internal cooling (with cooling holes) and external cooling (without cooling holes). Please be careful to select when placing an order. Recommended for material hardness within 40RC Internal Cooling Higher machining precision, better surface finish, uniform heat dissipation, prolonged tool life, and enhanced operational safety Drilling example SUS304, 6. 7mm RPM: 2300 Feed: