The Grainger 0.051" Diameter Lockwire Spool is 35.75 feet long and made of stainless steel. It has a tensile strength of 350,000 psi. The lockwire is used to prevent loosening of assemblies that are subject to vibration and is installed using a special plier. Common applications include securing aircraft engine bolts, hydraulic fittings, valves, and pumps. This product can withstand high temperatures up to 1000°F. The lockwire comes in a plastic dispenser with a cutter for convenience. It meets military specification MS20995C and is made in the USA.