1"-8 18-8 Stainless Steel Coarse Thread Nylon Insert Lock Nuts (2 pcs.)

Diameter: 1"
Diameter 2: 1-21/32"
Thickness: 1-1/16"
Material: Stainless Steel
Driver Type: 1-1/2" Wrench
Thread Size: 8 (Coarse)
Hardness: 18-8
Style: Waxed Nylon Insert
Type: Lock Nut

Box of 2.

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