Feature: 1. The transmission structure of worm shaft is simple, compact, small volume and light weight. 2. The worm is made of metal and the worm wheel is made of bronze, which has a long service life. 3. If you need more torsion or slower output speed, you can use it to replace the standard 4: 1 worm gear for Zhouyu worm gear box. 4. Similarly, the equipment reduces the chance of reverse drive to almost 0. 5. The worm gear is mounted on a 4.7 mm D‑axle diameter. The worm is mounted on a 6mm or 4.7mm D‑shaped shaft. Specification: Item Type: 10:1 Worm Wheel Gear ratio: 10: 1 Material: For SAE 841 bronze worm gear; metal worm Note: The worm gear is mounted on a 4.7 mm D-axle diameter. The worm is mounted on a 6mm or 4.7mm D-shaped shaft. Package List: 1 X Worm Wheel 1 X Worm Note: 1. The worm gear is mounted on a 4.7 mm D‑axle diameter. The worm is mounted on a 6mm or 4.7mm D‑shaped shaft. 2. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.