3/8"-16 x 2-1/4" Black Chrome Plated Steel Coarse Thread Hex Cap Screws

Diameter: 3/8"
Length: 2-1/4"
Material: Steel
Finish: Black Chrome
Head Style: Hex (9/16" Wrench)
Thread Size: 16 (Coarse)
Thread Length: 1" to 2"
Type: Cap Screw

Box of 3.

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