uxcell M8 Thread Dia Dome Head 316 Stainless Steel Cap Acorn Hex Nuts 20pcs Thread Size: M8/0.3"(Female.Diameter); Product Name: Cap Nuts Material: 316 Stainless Steel (6.8 Grade); Weight: 178g Package Content: 20pcs x Cap Nuts; Main Color: Silver Tone Dome Head Size: 12x8mm/0.47"x0.3"(Max.D*Height); Total Height: 15mm/0.6" Hex Width: 13mm/0.5"; Fastener Type: Cap Acorn Nut