Diameter: 3/8"
Length: 2-1/4"
Material: Stainless Steel
Finish: Polished
Head Style: Hex (9/16" Wrench)
Thread Size: 16 (Coarse)
Thread Length: 1"
Hardness: 18-8
Type: Cap Screw

Box of 3.

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