5/8"-11 x 2-1/4" Zinc Grade 2 / A307 Hex Bolts HBHS-461 (15 pcs.)

Diameter: 5/8"
Length: 2-1/4"
Material: Steel
Finish: Zinc
Head Style: Hex (15/16" Wrench)
Thread Size: 11 (Coarse)
Thread Length: 1-1/2"
Hardness: Grade 2 / A307
Type: Cap Screw

Box of 15.

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