Package Included:100pcs Spring Wave Washers. Size:Outer Diameter:15mm/0.59inch,Inner Diameter:8mm/0.31inch,Height:1mm/0.03inch.(Data Are All Manually Measured) Material:304 Stainless Steel, Corrosion-Resistant, Can Be Used In Humid Environments. Function:Protect The Surface Of The Connecting Piece To Prevent Scratches On The Surface Of The Workpiece When The Bolts And Nuts Are Tightened. Application:Generally Used For Loosening Occasions Of Small-Size Threaded Fasteners, Such As Electrical Connections On Household And Commercial Appliances, Automotive And Marine. The Wave Spring Gasket Presses The Connected Piece By Its Elastic Deformation To Prevent Loosening, The Wave Elastic Force Is Small, The Force Is Uniform, And The Surface Of The Connected Piece Is Not Damaged. It Is Usually Used In Occasions With General Anti-Loosening Requirements.