Hard-to-Find Fastener 014973228590 Acorn Cap Nuts, 3/8-16, Piece-100 Diameter: 3/8-Inch Material: Steel Finish: Nickel Driver Type: 9/16 Wrench Thread Type: 16 (Coarse) Diameter: 3/8" Material: Steel Finish: Nickel Driver Type: 9/16 Wrench Thread Type: 16 (Coarse)