Brand: RUKO Item: Hand tap Material: High-speed steel (HSS) Application: Thread making Finish: Bright Thread Length: 18mm Overall Length: 2.2in (56mm) For Use On: Aluminum, brass, plastic, steel, bronze and cast iron Thread: M8 x 1.0 fine threads per DIN 2181 Tap Drill Size: 7mm Shank: Square shank per DIN 10 RUKO hand tap, M8 x 1.0 fine, square shank per DIN 10, high-speed steel (HSS), bright finish.