Ratchet tightener muaj lub cev nyhav, qhov me me, kev teeb tsa me me, qhov tsim nyog sib txuas, lub zog me me, txo qhov hnav ntawm cov hlau hlau, thiab txhim kho kev ua haujlwm ntawm tag nrho lub tshuab. Kev ua haujlwm yog yooj yim dua thiab yooj yim dua.
