Diameter: 5/16"
Length: 1-1/2"
Material: Steel
Finish: Chrome
Head Style: Hex (1/2" Wrench)
Thread Size: 24 (Fine)
Thread Length: 1" to 2"
Hardness: Grade 5
Type: Cap Screw

Box of 10.

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