The working range covers 12″ to 4″ and is suitable for the assembly of inner and basic type winding mats with 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.