Milwaukee's Thunderbolt Silver and Deming drill bits are designed for performance in low to high tensile strength materials, stainless steel and cast iron. Thunderbolt twist drill bits are made from premium industrial grade steel with heavy duty cutting surfaces that powers through deep or shallow holes with lightning speed. Thunderbolt twist drill bits have a heavy duty 118 degree split point for easy penetration and a 1/2 inch 3-milled flats shank. One per package.

• 1-1/8 in. diameter, Silver & Deming.
• 1/2 in. 3-milled flats shank.
• Standard flute.
• Heavy-duty 118 degree split point for easy penetration.