[Tap Drill for Threading] This tap drill set is a tool designed specifically for threading. The main body is made of high-speed steel, and has a high degree of hardness. Made of highly abrasion resistant and high heat resistant tool steel that can be screwed into soft metals such as aluminum plates and steel plates. This tap drill has been a very useful addition to any other tap drill. An indispensable tool for screwing. Multi-functional integrated chamfering tap: This tap drill set uses a unique design that allows you to drill holes at the same time, tapping and chamfering. Multi-function integration. No need to change it over and over again. Easy, easy to save time and energy. [6 Sets to Meet Your Demand] This tap drill set has 6 tap drills. (Metric 6PC: M 3*0.5mm, M 4*0.7mm, M 5*0.8mm, M 6*1mm, M 8*1.25mm, M10*1.5mm) There are various models available, so you can always choose from to suit your needs. Buy one time and meet all your demands. Long service life: The chamfering tap uses a spiral design, so debris can be easily removed during the tapping process. Breaking the blade of the tap drill is beneficial to reduce the phenomenon of breakage. It has a longer service life compared to regular tap drills. Product Specifications: Material: High-speed steel. Size: Total length 2.3 inches (58 mm), Blade length 1.1 inches (28 mm), Handle length 1.2 inches (30 mm). (Universal 6.35mm square handle) Metric 6PC: M 3*0.5mm, M 4*0.7mm, M 5*0.8mm, M 6*1mm, M 8*1.25mm, M10*1.5mm.