High-quality 304 untarnished steel nylon go through Material : 304 untarnished Steel, Nylon Package quantity : 165-Piece Package Includes : M3..................................45-Piece M4 ... 35-Piece M5..................................30-Piece M6..................................25-Piece M8..................................15-Piece M10................................10-Piece M12.................................5-Piece count : 165-Piece Comes with a impressible Organizer Box for Storage Seven piece of land sizes for head purpose use, nylon insert grips bolt threads to prevent loosening.