TE-CO 42604 - 7/16" Hardened Flat Washer - 12 pieces $19.08 Brand TE-CO MPN 42604 Country/Region of Manufacture United States condition New Stud Size: 7/16"Model No.: 42604Inside Diameter: 15/32"Thickness: 1/8"Outside Diameter: 1"Includes 12 piecesBlack Oxide Finish Case Hardened C1010 Material. Many sizes conform to TCMAI standards