5/8"-18 x 5-1/2" Zinc Plated Grade 5 Steel Fine Thread Hex Cap Screws

Diameter: 5/8"
Length: 5-1/2"
Material: Steel
Finish: Zinc
Head Style: Hex (15/16" Wrench)
Thread Size: 18 (Fine)
Thread Length: 1-1/2"
Hardness: Grade 5
Type: Cap Screw

Box of 25.

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