Z9936 Countersunk Washer,Stl,1/4 In Item Description Countersunk Washer, Steel, Black Oxide Finish, Fits Bolts Sizes 1/4 In, Inside Dia 9/32 In, Outside Dia 1 3/8 In, Thickness 9/32 In, Thickness Tolerance +/-0.010 In, Rockwell Hardness B84, For Finished Appearance, For Use With Flat Socket Head Cap Screw, Package 1 Decorative black finish USA Made Details About Us MPN: Z9936 ITEM: COLOR: MATERIAL: Steel