Brand: RUKO Item: Machine tap Material: 5% cobalt high-speed steel (HSSE-Co5) Application: Thread making Finish: Bright Thread Length: 0.51in Overall Length: 2.5in (64mm) For Use On: Stainless steel, brass, steel, aluminum, bronze, plastic and cast iron Thread: #8-32 UNC per ANSI/ASME B1.1 Tap Drill Size: #29 drill size Shank: Square shank per DIN 10, reinforced for through threads RUKO machine tap, #8-32 UNC, square shank per DIN 10, reinforced for through threads, 5% cobalt high-speed steel (HSSE-Co5), bright finish.