For milling grooving at 90 degrees around the inner circumference of ≥φ150 outer rings. br br Please check our website for more information. br br br Send me email: cixiseal@gmail.com. WhatsApp: +8615355846467. br br Any kind of enquiry and question would be taken seriously. We will contact you as soon as possible and offer you the corresponding services. Any enquiry is welcome.