3/8"-16 x 3-1/2" 18-8 Stainless Steel Coarse Thread Hex Cap Screws

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

Box of 25.

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