Typical hardness is HRB 68 - HRC 32

this toggle bolt comes with the promise of both high quality and durability

Over-sized threads are wider than gutter spikes

5/8-11 x 10 Grade 8 Hex Cap Screw Yellow Zinc Plated

27/32 x 6 Reduced Shank Drill Bit (1/2 Shank) Finished Hex Nuts 18-8 Stainless Steel Typical hardness is HRB 6827 32 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.