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These are Du-Bro's "Permanent Mount" 4-40 Blind Nuts. FEATURES: Zinc plated, metal construction. Ideal for mounting engines, landing gear, cowls, hatches, etc. The perfect mounting nut for hard to reach areas. INCLUDES: (4) Blind Nuts REQUIRES: Drilling a 4mm hole to install SPECS: Diameter: 8mm OD of flange Length: 4mm Thread Size: 4-40 tjt 032102 ir/kh kr3/14/03 BOX DIMENSIONS: 2.25" W. X .25" H. X 2.25" L. BOX WEIGHT: .02 LBS.