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High-quality 304 stainless steel nylon lock nuts Material: 304 Stainless Steel, Nylon Package quantity: 175-Piece Package Includes: M3..................................55-Piece M4 .................................35-Piece M5..................................30-Piece M6..................................25-Piece M8..................................15-Piece M10................................10-Piece M12.................................5-Piece Total: 175-Piece Comes with a Plastic Organizer Box for Storage Seven common sizes for general purpose use, nylon insert grips bolt threads to prevent loosening.