SOLID STEEL MATERIAL: Made of strong steel with super abrasion resistance. Compared with other metal materials, steel has good hardness and wear resistance, and it is not easy to break under high pressure. ️DOUBLE HEAD DESIGN: This is a 4 pin double headed socket wrench. One end has an inner diameter of 20mm and the other end has an inner diameter of 24mm. ️OUTER DIAMETER SIZE: The outer diameter of one end of the socket wrench is 25.5mm, and the outer diameter of the other end is 30mm. If you want to use it, you need a 1/2 inch drive. ️WIDE RANGE OF APPLICATIONS: This clutch disassembly tool is suitable for mountain bikes, dirt bikes, go-karts, electric bikes, etc. It is a very easy to use motorcycle repair tool.