3/8"-16 x 4" Plain Grade 5 Steel Left Hand Thread Hex Cap Screws

Diameter: 3/8"
Length: 4"
Material: Steel
Finish: Plain
Head Style: Hex (9/16" Wrench)
Thread Size: 16 (Left Hand|Coarse)
Thread Length: 1" to 2"
Hardness: Grade 5
Style: Left Hand
Type: Cap Screw

Box of 2.

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