Features: Capable of automatic head rotation, uniform expansion Carbon steel ensures durability and corrosion resistance Used to replace CT-100 or CT-300 tubular expander 11 models, you can choose freely to meet your needs The quality is guaranteed, worth buying Specification: Name: Expander Head Material: Carbon Steel Color: Black Silver Size1: Approx. 3/8": Diameter 10mm Size2: Approx. 1/2": Diameter 12mm Size3: Approx. 5/8": Diameter 16mm Size4: Approx. 3/4": Dia. 19mm Size5: Approx. 7/8": Dia. 22mm Size6: Approx. 1": Dia. 25mm Size7: Approx. 1-1/8": Dia. 28mm Size8: Approx. -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 Package includes: 1Pc x Expander Head Note: 1. Please allow 1-2mm errors due to manual measurement, make sure you don't mind before ordering. 2. Due to the difference between different monitors The image may not reflect the actual color of the item.