3/4"-16 Zinc Plated Grade 8 Steel Fine Thread Nylon Insert Lock Nuts (4 pcs.)

Diameter: 3/4"
Diameter 2: 1-7/32"
Thickness: 57/64"
Material: Steel
Finish: Yellow Zinc
Driver Type: 1-1/8" Wrench
Thread Size: 16 (Fine)
Hardness: Grade 8
Style: Nylon Insert
Type: Lock Nut

Box of 4.

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