1、High Speed Steel Material: Made of premium high speed steel material, these drill taps are strong and sturdy, not easy to break, which ensure long life span. 2、Using Instruction: When tapping, first insert the head tap to make the tap center line consistent with the drilling center line. Rotate both hands evenly and apply slight pressure to feed the tap. No pressure is required after feeding. 3、Using Instruction: Every time the tap is rotated, it should be reversed by about 45 ° to cut off the chips to avoid blockage. If the tap is difficult to rotate, do not increase the rotation force, otherwise the tap will break. 4、6Pcs: There are 6 pieces drill taps in this package of different sizes, you can use them respectively to meet different needs. 5、Portable: Comes with a small size and lightweight as well, this drill tap kit can be easily taken with you to help with your work.