These are Great Planes" 4-40 Nylon Insert Lock Nuts. / / FEATURES: Metal construction with zinc plating to prevent rust from oxidizing / on parts. / White nylon inserts / Comes in a Parts-Pak clear plastic box with resealable lid / One year quality guarantee / / INCLUDES: (4) Lock Nuts / / REQUIRES: ¼" Wrench / / SPECS: Thread Size: 4-40 / KPM 11/02/93 / ir/jl / kr3/18/03