Cater Accessories: 1.1P7249,2M0344,4K6049,5P0991,6V2733,8E8341 2.ISO9001:2000 3.GCr15 Cater Accessories: Cater Accessories are used in construction machinery and mining machinery , the outer diameter is from 50mm-1000mm. The material is chrome molybdenom casting iron. The hardness is HRC58-62 , the working face precision within 0.015um , flatness up to 0.1um-0.2um ,the lifetime is more than ...