5/16"-18 x 2-1/2" 316 Stainless Steel Coarse Thread Hex Cap Screws

Diameter: 5/16"
Length: 2-1/2"
Material: Stainless Steel
Head Style: Hex (1/2" Wrench)
Thread Size: 18 (Coarse)
Thread Length: 7/8"
Hardness: 316
Type: Cap Screw

Box of 6.

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