Wire Size 21 Cobalt Aircraft Drill Bit
- COBALT MATERIAL: Cobalt Steel is the premium material with high hardness and red hardness to enable long drilling life.
- SPLIT POINT ANGLE 135 DEG.: No center punch is needed- the aggressive 135 deg.tip.
- Wire Size 21 Cobalt Drill Bit is a type of drill bit that is designed for drilling through hard metals, such as stainless steel, titanium, and inconel. Cobalt drill bits have a higher heat resistance and durability than standard high-speed steel drill bits, making them ideal for aerospace applications. Wire size drill bits are numbered from 1 to 80, with lower numbers indicating larger diameters. Size 21 corresponds to a diameter of 0.159 inches or 4.04 mm. Cobalt drill bits have a split point tip that reduces walking and a 135-degree angle that improves penetration.