Diameter: 1/4"
Length: 1-1/4"
Material: Steel
Finish: Yellow Zinc
Head Style: Hex (7/16" Wrench)
Thread Size: 28 (Fine)
Thread Length: 1-1/4"
Hardness: Grade 8
Type: Cap Screw

Box of 20.

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