Force Chain-tightener for Single speed

Force chain tightener for single speed bikes.

Are you dealing with a loose chain, and are you tired of tightening the chain repeatedly?
This tool is for you! Screw on where the rear derailleur is supposed to sit, and keeps the chain tight.
Fits all bikes where a rear derailleur is mounted.
Can be adjusted sideways approx.4 cm.
Aluminium.