1/4"-28 Chrome Plated Steel Fine Thread Nylon Insert Lock Nuts

Diameter: 1/4"
Diameter 2: 1/2"
Thickness: 5/16"
Material: Steel
Finish: Chrome
Driver Type: 7/16" Wrench
Thread Size: 28 (Fine)
Style: Nylon Insert
Type: Lock Nut

Box of 10.

A lock nut is a nut that resists loosening under vibrations and torque.