Diameter: 1"
Length: 3-1/2"
Material: Stainless Steel
Head Style: Hex (1-1/2" Wrench)
Thread Size: 8 (Coarse)
Thread Length: 2-1/4"
Hardness: 18-8
Type: Cap Screw

Box of 5.

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