3/4"-16 18-8 Stainless Steel Fine Thread Type C Lock Nuts (2 pcs.)

Diameter: 3/4"
Diameter 2: 1-1/4"
Thickness: 21/32"
Material: Stainless Steel
Driver Type: 1-1/8" Wrench
Thread Size: 16 (Fine)
Hardness: 18-8
Style: Type C
Type: Lock Nut

Box of 2.

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