5/16"-18 x 1" Black Chrome Plated Steel Coarse Thread Hex Cap Screws

Diameter: 5/16"
Length: 1"
Material: Steel
Finish: Black Chrome
Head Style: Hex (1/2" Wrench)
Thread Size: 18 (Coarse)
Thread Length: Full
Type: Cap Screw

Box of 6.

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