3/32 Heavy Duty Jobber Drill Bit

Screws with a diameter over 1 ½ inches have a hardness rating of HRB 95 - HRC 35

split bolt anchor

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41/64 x 6 Reduced Shank Drill Bit (1/2 Shank) Reduced Shank Drill Bits - 1/2 Shank 3/32 Heavy Duty Jobber Drill41 64 x 6 Reduced Shank Drill Bit (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.