... device is optional. rolling shape: rolling thread, textured, ruled, roll bars etc FR-10x30 3T CAM full tooth machine,steel bar thread ... ,steel pipe making machineModel: FR-10*30 3T CAM full tooth machineScrew diameter rolled: 2-6MMPitch range : 0.4-1PThe ... and durable.6, Automatic feeding device is optional.7, rolling shape: rolling thread, textured, ruled, rolling light, cross knurling, roll bars ...