Drill America 5-piece cobalt drill bit set 1/4 to 1/2 inch

Drill America Cobalt Bit Set

The Drill America five-piece set contains cobalt steel jobber-length bits ranging from one-quarter to one-half inch. It is aimed at mechanics and fabricators who regularly drill stainless steel, inconel, titanium and other high-tensile alloys. The 135-degree split point is self-centering and reduces the thrust needed to start a hole. A plastic pouch keeps the bits organised in a toolbox or drawer.

Sustained Drilling Performance

Cobalt steel retains hardness at elevated temperatures, allowing cutting speeds up to thirty percent higher than conventional M2 high-speed steel during prolonged use. The material meets National Aerospace Standard 907, indicating consistent metallurgy for repetitive heavy-duty work. The split-point geometry helps maintain accuracy and lower cutting forces even as the bit warms. The set covers common fractional sizes for general shop tasks.

Installation And Common Issues

Each bit fits any standard three-jaw chuck that accepts the corresponding shank diameter, so no special holders are required. The self-centering point eliminates the need for a centre punch in most materials. Users should verify that their drill press or hand drill provides adequate torque for the larger diameters. California Proposition 65 warnings apply because the bits contain a listed chemical.