1. Extended range 4.5"-9"
2. Chain: 520/150
3. A complete set of extension chain tools to meet your various needs.
4. The X-ring oil seal chain has strong tensile strength and good mute effect.
5. This chain is wear-resistant and has a long service life, and is suitable for high-speed movements above 250km/h.
6. Extensions are the perfect way to add a few inches to your factory set-up.
7. Easy to install, no modification needed.