Material: Aluminum alloy body and carbon steel mandrel ensure rust resistance and durability. Size Range: Available in diameters from 2.4mm to 6.4mm and lengths from 4mm to 60mm for versatile applications. Head Type: Dome head design provides a smooth finish and secure fastening. Compatibility: Designed for use with standard rivet s, easy to install. Quantity: Each package contains 50 pieces for multiple projects., Manufacturer: FBANULPEX