1/2"-20 x 4" 18-8 Stainless Steel Fine Thread Hex Cap Screws

Diameter: 1/2"
Length: 4"
Material: Stainless Steel
Head Style: Hex (3/4" Wrench)
Thread Size: 20 (Fine)
Thread Length: 1-1/4"
Hardness: 18-8
Type: Cap Screw

Box of 6.

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