Lock Rings Made from aluminum. 1/2" through 3/4" lock rings are single items only. 7/8" and larger lock rings come with a thread protecting nylon ball and set screw. Size : Options 1/2"-20 9/16"-18 5/8"-18 3/4"-16 7/8"-14 1"-14 1 1/4"-12 1 1/2"-12 Nylon Ball Set Screw Option Not available Item# How to Order