5/16"-24 x 3" 18-8 Stainless Hex Cap Screws CSHSS-215 (8 pcs.)

Diameter: 5/16"
Length: 3"
Material: Stainless Steel
Head Style: Hex (1/2" Wrench)
Thread Size: 24 (Fine)
Thread Length: 7/8"
Hardness: 18-8
Type: Cap Screw

Box of 8.

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