Components 25mm B-Screw for Giant Cog

When using a 40t or 42t cog with most Shimano derailleurs, a longer B-screw is required. This B-screw has a size of M4x25mm.

Using this B-screw is quite easy. When you install a 40t or 42t cog with most Shimano derailleurs, just replace the original screw with this 25mm one. Make sure it's tightened properly. As for maintenance, keep it clean and dry. If it gets dirty, you can wipe it with a dry cloth. Avoid using it in extremely wet or corrosive environments to prevent damage.