Heavy Duty Hex Nut - Thread Size: M8-1.25mm Measurement System: Metric; Size - M8 Serrated Flange Hex Nuts Height: 8mm; Hex Width: 13mm; Flange Part Out Diameter: 17.9mm; Note: with a tolerance of less than 0.2mm 304 Stainless Steel - Our serrated flange hex nuts assortment kit is made of premium quality 304 Stainless Steel, can provides strength and great protection, good for outdoor use Convenient Packaging - You will get 30 pieces serrated flange hex nuts are packaged in a clear plastic box, which keeps them organized and easily accessible; also helps prevent damage to the nuts during storage and transportation Replacement Nuts - Flanged nuts spread their fastening force over a area than traditional nuts, this reduces the potential for damage to the mounting surface and allows for a more secure connection on uneven mounting surfaces; Widely used and construction Dimensional Standards: DIN6923 Colour:silver Material:Stainless steel Package Contents: 1 set x nut Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.