this tools are specially high quality imported from Taiwan, so they will last forever, the thread cutter is 10x sharper than the china cutter and so is the quality of the other tools, Sewing Machine, Overlock & Serger Service Kit - Set of 4 Tools Includes: 2 Different Size Screwdrivers, Tweezer, Double Headed lint Brush - Boost The Performance of Your Machine Sewing Machine, Overlock & Serger Service Kit - Maintain Your Machine Like A Pro. For Both A Normal Sewing Machine And An Overlock Machine. The kit includes: 2 screwdriver, tweezer, Double headed lint brush All the tools are made up of high-quality materials to ensure that they durable and help in easy maintenance of your machine over a long period of time. a (2.8 mm) screwdriver which is quite useful for bobbin case tension adjustment, a 0.177 inch (4.5 mm) which can be used for general care, a tweezer for removing those stubborn threads that have gotten caught in the feed dogs and clogged the machine and a large a double headed lint brush with different hardness bristles to let you clean different parts of your machine.