1、This set of repair tools is made of high‑quality steel to be stable and durable. The super torsion can help you save energy. It can be used in combination with a wrench. 2、This repair tools is suitable for mountain bike crankshafts. It is used to disassemble square and knurled crankshafts. It is easy to operate and very suitable for bicycle repairs. 3、Puller tool, extended ejector, used to disassemble chain link and crank, very suitable for square cone crank set, combined with wrench crank puller removal tool. 4、The bottom bracket tool, 20 teeth, is used to remove the bottom bracket of the bicycle and high‑strength steel structure is very durable. 5、This bicycle chain cutter has a compact and portable design, is comfortable to operate, and is easy to chain. It is specially designed to remove and install chain bolts. 6、Professional and practical bicycle repair tool kit, including a crank extractor, a chassis remover and a 16mm wrench, and is mainly made of high-grade hard metal materials, durable. 7、Crank extractor is used to remove the square crank arm. You only need a 5/8in or 16mm wrench or an adjustable wrench, while the bottom bracket remover can be used with a 24mm socket, wrench or adjustable wrench.