A hex cap screw has a hexagonal head, designed to be driven by a wrench.

Diameter: 9/16"
Length: 5"
Material: Steel
Finish: Yellow Zinc
Head Style: Hex (13/16" Wrench)
Thread Size: 18 (Fine)
Thread Length: 1-3/8"
Hardness: Grade 8
Type: Cap Screw

Box of 10.

Diameter: 1/2"
Length: 5"
Material: Steel
Finish: Yellow Zinc
Head Style: Hex (3/4" Wrench)
Thread Size: 13 (Coarse)
Thread Length: 1-1/4"
Hardness: Grade 8
Type: Cap Screw

Diameter: 7/16"
Length: 5"
Material: Steel
Finish: Yellow Zinc
Head Style: Hex (5/8" Wrench)
Thread Size: 14 (Coarse)
Thread Length: 1-1/8"
Hardness: Grade 8
Type: Cap Screw

Diameter: 5/16"
Length: 5"
Material: Steel
Finish: Yellow Zinc
Head Style: Hex (1/2" Wrench)
Thread Size: 18 (Coarse)
Thread Length: 7/8"
Hardness: Grade 8
Type: Cap Screw