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These are 4x1/2" Button Head Sheet Metal Screws by Du-Bro. FEATURES: Zinc plated metal construction with clear chromate. Non-slip socket drive insert. The large head of the screw acts as a washer. A new design that's great for mounting servos, cowls, landing gear, etc. INCLUDES: (8) Screws SPECS: Length: 1/2" Diameter: 4mm COMMENTS: This uses a 1/16" size allen wrench (GPMR8006) kr3/29/05 BOX DIMENSIONS: 2.25" W. X .25" H. X 2.25" L. BOX WEIGHT: .01 LBS.