Features: brand new and high quality Automatic for head rotation capability, uniform expansion Carbon steel ensures durability and corrosion resistance Used to replace CT-100 or CT-300 tube expander 11 models, you can choose arbitrarily to meet your needs Quality is guaranteed, worth buying Specifications: Material:Carbon Steel Color :Black Size1: Approx.3/8": diameter 10mm Size2: Approx.1/2": diameter 12mm Size3: Approx.5/8": diameter 16mm Size4: Approx.3/4": diameter 19mm Size5: Approx.7/8": diameter 22mm Size6: Approx.1": diameter 25mm Size7: Approx.1-1/8": diameter 28mm Size8: Approx.1-1/4": diameter 32mm Size9: Approx.1-3/8": diameter 35mm Size10: Approx.1-1/2": diameter 38mm Size11: Approx.1-5/8": diameter 42mm Note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1PcxExpander for Head