5piece Tube Expander Set for Copper Pipes A practical tool set designed to expand copper tubing when installing air conditioning systems and performing HVAC or refrigeration work. Made from bearing steel for durability, each expander fits a common tube size and mounts in a handheld electric drill for quick operation. Key benefits Durable construction: bearing steel body for long service life. Versatile sizing: five expanders cover common copper pipe diameters to simplify pipe joining and improve conversion success. Easy to use: 1/4 inch (6.35 mm) hex shank fits standard drill chucks and quickchange hex adapters for fast tool changes. Reliable finish: blackening surface treatment for a consistent working surface. Saves time: one set eliminates the need to source individual expanders on site. Function and compatibility Function: expands copper pipe ends so two copper pipes can be interconnected during air conditioner installation. Requires a handheld electric drill for installation and operation. Suitable for copper tubing used in air conditioning, HVAC maintenance, refrigeration lines, and related plumbing tasks. Contents and specifications Quantity: 5 tube expanders Sizes: 3/4 (19 mm), 5/8 (15.9 mm), 1/2 (12.7 mm), 3/8 (9.5 mm), 1/4 (6.3 mm) Shank diameter: 1/4 inch (6.35 mm) hexagonal handle Material: bearing steel Surface treatment: blackening Color: Gold (appearance may vary due to lighting and monitor settings) Typical applications Installing split air conditioning systems where copper lines must be joined on site. HVAC service and maintenance for expanding pipe ends prior to brazing or fitting. Refrigeration linework and plumbing tasks that require precise pipe end expansion. Notes Allow 1 to 3 cm measuring deviation due to manual measurement. Actual color of the item may vary slightly from photos because of different monitors and lighting conditions.