The tools are made of 420 stainless steel, very durable. It is a good product for different levels of work. It technically has everything you need, and the basic function of laying flat works well. Besides, you can easily rotate because of the small body and very well built. It is convenient to use in the whole process. repair. 15 MULTI-FUNCTION ALL IN ONE TOOL - Universal Chain Tool / Hex Wrench (Allen Keys) -1.5, 2, 2.5, 3, 4, 5, 6, 8, 9mm / Screwdriver flathead/Philips Screwdriver.So cool and complete repair kit. Bike repair tool kits are made of high quality carbon steel with harder steel version. Fine and professional workmanship, fashion design, durable, stronger and more efficient. Its weight is only 7.77oz / 0.48lb, super light and portable. Easy to carry out.These bike repair tool kits are small enough to throw in your bag or pocket. An essential tool for cyclists when they break down on the trail. Used for all kinds of bicycles, bicycle repair tool kits can help you solve problems easily. It can also do the basic maintenance work, can be used as a daily household repair tool.