Item description for 7/16"-20 x 3" 18-8 Stainless Hex Cap Screws (3 pcs.)

Diameter: 7/16"
Length: 3"
Material: Stainless Steel
Head Style: Hex (5/8" Wrench)
Thread Size: 20 (Fine)
Thread Length: 1-1/8"
Hardness: 18-8
Type: Cap Screw

Box of 3.

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