High quality. Made of high-quality materials for maximum durability and reliability. Easy to install, no complicated tools required, easy to use. Application Model:For Excacvator 317B L 317B LN 318B 318B N 320B 320B L Part Number:189-5746 1895746 318-1181 3181181 Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:As Shown Material:Plastic Package Contents: 1 * RPM Speed Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.