uxcell M8 Thread Dia Dome Head Carbide Steel Cap Acorn Hex Nuts Black 20pcs Thread Size: M8/0.3"(Female.Diameter); Product Name: Cap Nuts Material: Carbide Steel (4.8 Grade); Weight: 207g Package Content: 20pcs x Cap Nuts; Main Color: Black Dome Head Size: 15x9mm/0.6"x0.35"(Max.D*Height); Total Height: 15mm/0.6" Hex Width: 15mm/0.6"; Fastener Type: Cap Acorn Nut