5/16"-18 x 5/8" 18-8 Stainless Hex Cap Screws CSHSS-177 (50 pcs.)

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

Box of 50.

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