Features: Wrenches and taps are made of high-quality steel for durability and long service life. The wrench is very convenient and practical and is a necessary tool for thread cutting. Adjustable chuck clamps the tap easily and firmly. Mainly used for hand tapping. This set includes four taps of different sizes for tapping different threads. It is an excellent tool kit that can be used to create threads on wood, plastic, aluminum or many other soft materials. Specifications: Material: Bearing steel Tap size: M3, M4, M5, M6 Tapping: Aluminum, wood, plastic and other soft materials Instruction: 1. First insert the taper part and make sure the tap's center line is aligned with the drill's center line. 2. Turn the wrench with a steady force to feed the tap. You don't need to apply any force after feeding. 3, Turn back 45° each time, turn the tip to cut the chip to avoid jamming. 4, If it is difficult to turn the tap, stop increasing the force, otherwise the tap will break. Package includes: 1 x Wrench 4 x Taps