A WASHER IS MADE PREDOMINANTLY FROM A THIN METAL THAT WHEN IN USE, ABLE TO EFFECTIVELY DISTRIBUTE THE LOAD OF BOLT OR NUT, INCREASING THE SURFACE AREA AVAILABLE. COPPER IS A SOFTER METAL THAT IS ABLE TO PROVIDE A FAR MORE EFFECTIVE SEAL THAN OTHER METALS AND ARE EASILY REPLACEABLE OR ANNEALED. THE COPPER WASHER IS AVAILABLE IN A PACK OF 25; M14X22.