... bits and cutters for shield machine.Round cutter Parts No.as C31HD, B47k17H, B47k19H, B47k22H,Flat cutter Parts ... No. as BFZ80, BFZ70,Bucket teeth T25series and holder, ... T18 series and holder,Holders parts No. as C30, B43H, BHR73 etc. at same time, ... volume, and above-average economy is guaranteed Forging Holder Block System