5/16"-18 x 1" Plain Grade 5 Steel Left Hand Thread Hex Cap Screws

Diameter: 5/16"
Length: 1"
Material: Steel
Finish: Plain
Head Style: Hex (1/2" Wrench)
Thread Size: 18 (Left Hand|Coarse)
Thread Length: Full
Hardness: Grade 5
Style: Left Hand
Type: Cap Screw

Box of 3.

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