. Material: Made of 304 stainless steel, durable, corrosion-resistant and rust-resistant. Good design: The long thin threaded rod is hexagonal with 6 sides, providing good angular granularity for tool approach. Wide use: Rod nail hexagon is widely used in household and office appliances, communication equipment, ship assembly and other mechanical industries. Installation: Easy to install, requires a wrench to tighten so that two parts of the fastener or fitting are connected together. Make sure to tighten (do not over-tighten) the hex nuts correctly so that they do not fall off. Package includes: 6 pcs M6 x 1 pitch 30mm length 304 stainless steel metric hex coupling nuts (M6 x 30)