1-1/8"-7 Zinc Plated Grade 8 Steel Coarse Thread Lock Nuts (5 pcs.)

Diameter: 1-1/8"
Diameter 2: 1-7/8"
Thickness: 1-3/16"
Material: Steel
Finish: Yellow Zinc
Driver Type: 1-11/16" Wrench
Thread Size: 7 (Coarse)
Hardness: Grade 8
Style: Nylon Insert
Type: Lock Nut

Box of 5.

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