1/2"-20 x 4" Zinc Plated Grade 8 Steel Fine Thread Hex Cap Screws (8 pcs.)

Diameter: 1/2"
Length: 4"
Material: Steel
Finish: Yellow Zinc
Head Style: Hex (3/4" Wrench)
Thread Size: 20 (Fine)
Thread Length: 1-1/4"
Hardness: Grade 8
Type: Cap Screw

Box of 8.

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