Description: Compatibility: Specifically designed for industrial sewing machines with pinned or screwed handwheels to the main shaft. Work with all digital brushless servo motors Versatile Stitching: Ideal for corner stitching and other tasks requiring specific needle positions, our synchronizer enhances flexibility and accuracy in your sewing projects Functionality: The is allows for up or down needle positioning, accommodating a wide range of stitching requirements. How to synchronize: The needle should be down but about to come back up. Adjust the handwheel to the right position while holding the needle positioners stationary. Untighten and tighten the screws to adjust when necessary Efficient Workflow: Stream Line your operations by incorporating our synchronizer, designed to needle control and positioning, ultimately boosting efficiency in your sewing tasks Specification: Material: Steel Size Chart: 20cmx5cmx7cm/7.87inchx1.97inchx2.76inch Package Includes: 1 Motor External Fixed Needle Device Note: Please allow slightly errors 1-2cm differences due to manual measurement.