Baer Circular Die HSS - BSP - Left Hand - For General use - 1/4 x 19Baer Circular Die in high speed steel (HSS) is a precision external threading tool designed for metalworkers who need reliable BSP left hand threads. Sized at 1 4" diameter with 19 threads per inch, its built for general use applications in workshops and fabrication shops. Material: High speed steel (HSS) for durable cutting edges and long tool life in a variety of metals. Size and Thread: 1 4" diameter with 19 TPI, designed for BSP left hand thread