9/16"-18 x 1" Zinc Plated Grade 5 Steel Fine Thread Hex Cap Screws

Diameter: 9/16"
Length: 1"
Material: Steel
Finish: Zinc
Head Style: Hex (13/16" Wrench)
Thread Size: 18 (Fine)
Thread Length: 1"
Hardness: Grade 5
Type: Cap Screw

Box of 4.

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