IRWIN 9436 HANSON 3/8"-24 Nf thread 1" hexagon machine screw die (HCS) - 1" across flats. Ideal for maintenance and repair work. Recommended for use with hexagon die stock. Die can be used with a wrench or socket when space is limited. Advanced die geometry: allows for faster cutting with longer life. Material types: high carbon steel (HCS) for cutting of external threads by hand. Etched: die size is etched on each tool for easy identification.