Automatic winding type, thread length 4.5m with suitable plumb bob weight from 100 to 1000g. ABS resin case, resin elastomer, steel plumb. Can be installed on wood, iron, aluminium sashes and concrete.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.