5/16"-18 x 7/8" Polished 18-8 Stainless Steel Coarse Thread Hex Cap Screws

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

Box of 8.

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