3/4"-16 Zinc Plated Grade 2 Steel Fine Thread Top Lock Nuts

Diameter: 3/4"
Diameter 2: 1-7/32"
Thickness: 21/32"
Material: Steel
Finish: Zinc
Driver Type: 1-1/8" Wrench
Thread Size: 16 (Fine)
Hardness: Grade 2
Style: Top Lock|Type C
Type: Lock Nut

Box of 4.

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