Two different sizes of screw knife are made of plastic handle and carbon steel. It is used to adjust the tension of box.Various sewing machines, make the repair and cleaning of sewing machines easier, improve your work efficiency. This sewing machine tool kit includes 2 arc-shaped nose dumplings, 2 double velvet brushes, 4 needle board screwdrivers and 8 different screw knives, 5 sewing machines, a total of 21 sewing machine tools, which is enough to satisfy the satisfactionYour daily cleaning and repair sewing machine. A small curved , which is convenient for the narrow part of the sewing machine. The purpose is to facilitate removing the stubborn stubborn line that is stuck or blocked in a sewing machine. Made of nylon and stainless steel, double-headed bristles with different hardness easier to clean and difficult to reach, and meet different clean needs. High-quality steel, the shell is made of plastic.The tip is very , it is easy to remove the needle line, and it is easy to remove the needle line, which is very . There are 5 colors to choose from, fine workmanship and comfortable grip.This sewing machine repair kit has a variety of styles to choose from to meet your different maintenance needs.