This D7G idler wheel is equipped with high-precision sealed bearings inside, which enable smooth and fluid rotation with extremely low running resistance. Coupled with a special sealing structure, it has excellent waterproof and dustproof performance, allowing it to adapt to various harsh construction environments. It significantly extends the service life and reduces the maintenance cost.We manufacture different machine models track rollers and can offer customized products. Follow us,you will get the items what you request.