9/16"-18 x 3-1/2" Zinc Grade 5 Hex Cap Screws CSHS5-572 (25 pcs)

Diameter: 9/16"
Length: 3-1/2"
Material: Steel
Finish: Zinc
Head Style: Hex (13/16" Wrench)
Thread Size: 18 (Fine)
Thread Length: 1-3/8"
Hardness: Grade 5
Type: Cap Screw

Box of 25.

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