Pre-drilling is recommended near board-ends to prevent splitting

3/32 Cobalt Heavy Duty Jobber Drill Bit

The threaded stud version is available in eight diameters and multiple lengths

1/4 x 2 1/2 Round Split Drive Anchor Zinc Plated (100)

1/2-13 x 3 1/2 Hex Cap Screw SS 316 (A4)

43/64 x 6 Reduced Shank Drill Bit Cobalt (1/2 Shank) 12" Aircraft Bits - Fractional Pre-drilling is recommended near board-ends43 64 x 6 Reduced Shank Drill Bit Cobalt (1 2 Shank) . Expands the size range capacity of a 1 2 inch portable drill chuck. Common flute and overall length for minimal adjustment during tool changes. Precision ground for high degree of concentricity between shank and body diameter. Ideal for drilling in low and medium tensile strength materials.