Features: 1. Using high‑quality bearing steel material, high hardness, wear resistance. 2. It must be installed in a manual electric drill, strong and durable. 3. Contain 6 expanders of different sizes, which can meet the needs of daily maintenance. 4. Excellent workmanship, easy installation and long service life. 5. This pipe expander can connect two copper pipes to each other when the air conditioner is installed. Specification: Item Type: Pipe Expander Material: Bearing Steel Weight: Approx. 170g / 6oz Function: When air conditioning is installed, expand copper tube, make two copper tube mutual link. (To be installed on hand electric drill.) Size: 7/8 (Approx. 5x2cm / 2.0x0.8in) 3/4 (Approx. 5x2cm / 2.0x0.8in) 5/8 (Approx. 4.5x1.7cm / 1.8x0.7in) 1/2 (Approx. 4.5x1.5cm / 1.8x0.6in) 3/8 (Approx. 4x1.3cm / 1.6x0.5in) 1/4 (Approx. 4x1.1cm / 1.6x0.4in) Package List: 6 x Pipe Expander Features High-quality bearing steel material for enhanced durability and wear resistance. Compatible with manual electric drills, ensuring strength and longevity. 6 expanders of varying sizes for versatile and comprehensive maintenance needs. Easy installation and excellent craftsmanship for a hassle-free user experience. Enables seamless connection of two copper pipes during air conditioner installation.