Mandrel, Compatible Tool Type Power Inserting Tool, Compatible Insert Type Helical Inserts, Compatible Internal Thread Size #4-40, Compatible External Thread Size 1/4 In.-20, Material Steel, Overall Length Not Applicable, Product Type Pneumantic Tool Threaded Mandrel, Compatible Thread Type Coarse, Compatible with Grainger Part Number 10J330, Compatible with Manufacturer Model Number 8050-400C, Series Heli-Coil