the hardness rating is HRC 24-35

1 1/4-7 x 4 1/2 Socket Cap Screw Alloy

1/2 x 1 3/4 (1/4 Drive) Magnetic Nut Setter

3/4-16 L9 Hex Nut Alloy Cadmium Yellow and Wax Coated Domestic USA (300)

1/2-13 x 8 1/2 STRONG-BOLT® 2 Cracked and Uncracked Concrete Wedge Anchor Zinc Plated (25)

1/4 x 8 1/4 Powers Wedge-Bit™ SDS Shank SDS Plus Hammer Drill Bits the hardness rating is HRCPowers Wedge Bit SDS Shank is a robust and reliable tool to easily drill through tough materials such as concrete and tile. With a 1 4 inch diameter and 8 1 4 inch length, it delivers maximum efficiency with its shank optimized for greater performance and versatility.