M4180794 - Button Dies BSW 1? OD Button Dies are used for cutting a new male/external thread on studs. Carbon Alloy Steel threading tools are not suitable for precision, safety or critical thread. General purpose / DIY use only. Used with suitable button die holder. Solid round die fits into adjustable guide or plain die stock handle Cutting teeth provide a general purpose thread Made from Carbon Steel Bright finish for general purpose applications, non-ferrous metals & plastics Size 5/16 TPI - 18