Category 1 is the highest attainable anchor category for reliability

1/4 Cobalt Heavy Duty Jobber Drill Bit

9/16-12 x 2 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (25)

9/16-12 x 2 1/4 Grade 8 Hex Cap Screw Plain Domestic USA (25)

10-16 x 4 Phillips Drywall Self Drill Screw Zinc Plated (1000)

9/16-12 x 1 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (25) 5/16-18 Grade 8 Hex Cap Screws Yellow Zinc Plated - Domestic USA Category 1 is the highest9 16 12 x 1 1 2 Grade 8 Hex Cap Screw Plain Domestic USA (25). Grade 8 Hex Cap Screws are manufactured in the USA from medium carbon alloy steel. In diameters 1 4 to 1 1 2 inches our Grade 8 material meets or exceeds SAE J429 Grade 8 specifications. Diameters over 1 1 2 inches meet or exceed ASTM A354 Grade BD. All material is manufactured with rolled threads. Yellow zinc plated bolting will meet or exceed ASTM F1941. Typical hardness on diameters 1 4