Open End Blind Rivert, aluminum cover and steel rod. Product name: Open End Blind RivetMaterial: Rod is made of Steel, cover is made of aluminumColor:Black, red,blue,Gold is available.Size range: from 2.4X5---6.4X30MM,Hole Dia: 2.5mm,3.3mm,4.1mm,4.9mm,6.5mmFor more details please feel free to contact me,thanks!