CARBON STEEL These long shank hex nuts are made of carbon steel with electroplated surface which can provide high strength and good corrosion resistance. M6 SLEEVE Nuts are standard M6 thread which gives a good granularity to a tool. And the 6 sides will be easy to hold by the tools. 40MM SPACER * 5 PCS Hex Nuts are M640mm type, 5 pcs in total, perfect replacement for industrial and construction fasteners. SECURE WELLHex Hex Nuts are used to join bolts, studs or machine screws to secure two parts together as one piece. WIDE APPLICATIONS These long shank hex nuts can be widely used for home and office, communication equipment, ship assembly and other machinery industries. Shipping quantity: 5 pieces Product color: silver Product specification: M640mm