Check the listing for details. HSS Circular Split Die UNF 5/16 x 24 5/16" 1" OD. Condition: New. Listed at 21.81 USD. HSS Circular Split Die UNF 5/16 x 24 5/16" 1" OD DIES are usually round and are used for cutting external threads. They can be held in a Die Stock for hand operation or in a Die Holder for use by machine. Dies are usually split which enables adjustment for precision, and also to extend the life of the die as it wears. The lead at the front (etched) face is normally 3 pitches, for standard threading, and 2 pitches at the back face for closer threading, or soft materials. Industrial Quality Split Die in HSS Die is 1.0" OD Untitled Document HSS Circular Split Die UNF 5/16 x 24 5/16" 1" OD DIES are usually round and are used for cutting external threads. They can be held in a Die Stock for hand operation or in a Die Holder for use by machine. Dies are usually split which enables adjustment for precision, and also to extend the life of the die as it wears. The lead at the front (etched) face is normally 3 pitches, for standard threading, and 2 pitches at the back face for closer threading, or soft materials. Industrial Quality Split Die in HSS Die is 1.0" OD