Brand: RUKO Item: Machine tap Material: 5% cobalt high-speed steel (HSSE-Co5) Application: Thread making Finish: Bright Thread Length: 0.63in Overall Length: 2.8in (71mm) For Use On: Stainless steel, brass, steel, aluminum, bronze, plastic and cast iron Thread: #12-24 UNC per ANSI/ASME B1.1 Tap Drill Size: #16 drill size Shank: Square shank per DIN 10, reinforced for through threads RUKO machine tap, #12-24 UNC, square shank per DIN 10, reinforced for through threads, 5% cobalt high-speed steel (HSSE-Co5), bright finish.