Ringour rings follow din iso 96-1 & bis 3078 quality standards.our rings are suitable upto 21000rpm.features1)manufactured from fine grain ball bearing steel en31/sae 52100/100cr 6.2)our rings have very high level of accuracy as they are manufactured on x-generation cnc controlled machines.3)a special hardening process creates a structural condition that reduces wear and tear significantly.4)our imported harparizer gives best quality finish. Surface roughness is mere ra0. 1um in our rings. This improves a gliding of travellers on the ring as the coefficient of friction is extremely low.5)range:-type - flange, reversible, ear shape, conical, self lubricating, multi groove etc.flange - 1, 2, 3 & 5.dia. - from 32mm to 300mm.suitable for - all types of yarn including cotton, pc, pv, viscose, woolen & worsted, fishnet etc? ? ?