For various types of hexagonal sleeves, use corresponding wrenches. 12, 12, 14 or 17 must match. For 20, use 22 wrenches.
Wrench is a commonly used installation and disassembly tool, which is mainly divided into two types: dead wrench and movable wrench. It is a hand tool that uses the lever principle to twist the threads of bolts, screws, nuts, etc. to tightly hold the opening of bolts or nuts or sleeve fasteners.