With its exquisite workmanship and high quality, this product is very strong and hard to use, which is time-saving with its simple and convenient installation. Its hard material is designed to ensure sharp, fast execution, withholds strength and efficiency, which is convenient compatible you to choose the size that suits you. Made of high speed steel material, this product is wear-resistant and long lasting. There are two styles that you can choose from: A, B. It is suitable compatible using on wood, copper, brass, aluminum, sheet metal and plastic. And it cannot apply compatible Iron and steel materials since it is easy to break. Item Name: Tap Drill Bit Material: High Speed Steel Features: Easy to Use, Convenient, Quick Change Size Details: Short Size: M3 : Screw Length: 3.2cm/1.3", Handle Length: 2.2cm/0.9", Total Length: 5.4cm/2.1" (Approx.) M4 : Screw Length: 3.2cm/1.3", Handle Length: 2.2cm/0.9", Total Length: 5.4cm/2.1" (Approx.) M5 : Screw Length: 3.4cm/1.3", Handle Length: 2.2cm/0.9", Total Length: 5.6cm/2.2" (Approx.) M6 : Screw Length: 3.5cm/1.4", Handle Length: 2.2cm/0.9", Total Length: 5.7cm/2.2" (Approx.) M8 : Screw Length: 3.6cm/1.4", Handle Length: 2.2cm/0.9", Total Length: 5.8cm/2.3" (Approx.) M10: Screw Length: 3.6cm/1.4", Handle Length: 2.2cm/0.9", Total Length: 5.8cm/2.3" (Approx.) Long Size: M3 Screw Length: 4cm/1.6", Handle Length: 2.7cm/1.1", Total Length: 6.7cm/2.6" (Approx.) M4 Screw Length: 4.1cm/1.6", Handle Length: 2.7cm/1.1", Total Length: 6.8cm/2.7" (Approx.) M5 Screw Length: 4.3cm/1.7", Handle Length: 2.7cm/1.1", Total Length: 7cm/2.8" (Approx.) M6 Screw Length: 4.3cm/1.7", Handle Length: 2.7cm/1.1", Total Length: 7cm/2.8" (Approx.) M8 Screw Length: 4.6cm/1.8", Handle Length: 2.7cm/1.1", Total Length: 7.3cm/2.9" (Approx.) M10 Screw Length: 4.6cm/1.8", Handle Length: 2.7cm/1.1", Total Length: 7.3cm/2.9" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 6 x Tap Drill Bit