Cutting Die UNF-Unified Fine 5/16x24 HSS Right DORMER: Adjustable slotted cutting die, fine thread UNF 5/16″ with 24 threads per inch, designed to reduce torque when cutting by hand. Split dies can be adjusted in small increments up to a maximum of approximately 0.006″. Dimensions according to BS 1127:1950 standard with a 1″ outer diameter and 3/8″ thickness. HSS with a plain surface for threading in construction steel, carbon steel, ferritic stainless steel, gray cast iron, ductile iron, and compacted graphite cast iron. Additional technical specifications: Cutting material: HSS, height: 9.53, coating: uncoated.