Diameter: 3/8"
Length: 7/8"
Material: Steel
Finish: Zinc
Head Style: Hex (9/16" Wrench)
Thread Size: 24 (Fine)
Thread Length: 7/8"
Hardness: Grade 5
Type: Cap Screw

Box of 12.

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