OSG Threading Tap - BSF Spiral Point HSS-E - Steam Oxide Coated - Through Hole - 9/16 x 16Engineered for precision BSF threading, the OSG BSF Spiral Point Threading Tap delivers reliable, high quality through hole threads for critical assemblies. Built from HSS E cobalt with a Steam Oxide coating, its designed to endure demanding machining tasks and extend tool life. Thread Form: BSF Spiral Point geometry designed for through hole tapping and efficient chip evacuation. Material & Coating: HSS E (high speed steel with cobalt) with Steam