Typical hardness on diameters 1/4 to 2 1/2 inches is HRC 33-39

Get maximum performance out of your projects with these superior wood screws

1-8 x 1 Socket Set Screw Cup Point 18-8 (A2) Stainless Steel

7/16-20 x 1 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (825)

3 head ensures easy installation and reliable performance

1/2" x 12" Cobalt Aircraft Extension Drill Bit, GLBCOX121/2 Simpson Rod Coupling/Tie Wire/Duplex Crimp Drive Anchor Zinc Plated Typical hardness on diameters 1/41 2" x 12" Cobalt Aircraft Extension Drill Bit, GLBCOX121 2Manufactured to Aerospace Standard 907. Ideal where extra length for reach is required. These drill bits display high red hardness, permitting speeds up to 30% greater than with conventional M2 high speed steel, and are especially effective in drilling tough, high tensile strength materials like stainless steel, inconel, and titanium. The 135 split point is self centering and reduces thrust.