1-1/4"-7 Zinc Plated Grade 8 Steel Coarse Thread Lock Nuts (4 pcs.)

Diameter: 1-1/4"
Diameter 2: 2-3/32"
Thickness: 1-3/8"
Material: Steel
Finish: Yellow Zinc
Driver Type: 1-7/8" Wrench
Thread Size: 7 (Coarse)
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.