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These are Nylon Insert Lock Nuts from Du-Bro. FEATURES: Zinc plated, aircraft quality steel construction. Plum colored nylon insert. INCLUDES: (4) Lock Nuts SPECS: Thread Size: 4-40 EtH 6-14-94 kr3/17/03 BOX DIMENSIONS: 2.25" W. X .25" H. X 2.25" L. BOX WEIGHT: .02 LBS.