... payment and after-sale service Adapter sleeve Materialcast iron or chrome steel(GCR15) or carbon steel(GCR11)HardnessHRC60-65Tolerance standardGB/T307(ISO492 ... ,H3168,H3172,H3176,H3180,H3184,H3188,H3192,H3196 Adapter sleeve(H3000 series)H3024,H3026,H3028,H3030,H3032,H3034,H3036, ... ,H3068,H3072,H3076,H3080,H3084,H3088,H3092,H3096 Adapter sleeve(H2300 series)H2304,H2305,H2306,H2307,H2308,H2309,H2310, ...