Mandrel/Nosepiece Set, Compatible Tool Type Thread Setting Tool, Compatible Insert Type Rivet Nuts, Compatible Internal Thread Size 5/16 In.-18, Compatible External Thread Size 5/16 In.-18, Material Steel, Overall Length 4 in, Product Type Mandrel and Nosepiece Set, Compatible Grainger Part Number 4BB23, Compatible with Manufacturer Model Number 4BB23, Includes –