It has high and uniform hardness, wear resistance, and a high elastic limit, making it durable and easy to usea reliable assistant for work and daily life. [MULTI SIZE]: 7/8 inch, 3/4 inch, 5/8 inch, 1/2 inch, 3/8 inch, 1/4 inch. Includes 6 different sizes to meet your needs. [FUNCTION AND EASY TO INSTALL]: Designed for air conditioner installation, expands tubing to create secure connections. To be used with a manual or electric drill. Ideal for both beginners and experienced professionals. High-performance forging tools make pipe expansion easier and more efficient. [PRECISION]: Produces consistent flares with uniform size for a perfect fit. Swages to precise depth, ensuring proper fitting and easier brazing while reducing fatigue stress at the coupling area. [GREAT PRESSING TOOLS]: Advanced system for shaping tubes using heat through friction, increasing surface contact between the flare and valve. Complete set of forging tools allows easy expansion of HVAC tubing. Forging plug ensures accurate depth for reliable results. Material: Metal Color: Black Package Contents: 6 * Hexagonal Handle Tube Expanders Note: The above package includes only the listed items; others are not included. Lighting and display differences may cause slight color variations between the image and actual item. Measurement error allowance: +/- 1-3 cm.