Drop Forged Solid Steel Rollers from Shandong Zhoujin CNC Machinery Co., ltd.1. Materials: Drop Forged, Cast Iron, Solid Bar2. Grooved, or Solid3. CNC TurningOur factory has been specilizing in Precision Machining of Bearing Cups, Cones, Rings, Bushes, and Wheel Pulleys. So we have the ability for volume production and cost effective, quality..