Size: This Tube Expander Tool is equipped with 5 different sizes of drill bit: 1/4inch(6 mm), 3/8inch (10 mm), 1/2inch(12 mm), 5/8inch (16 mm), and 3/4inch(19 mm). It saves you valuable time by making leak-free copper connections efficiently and quickly Material: Made of premium carbon steel with high temperature hardening process. Its robust construction ensures resistance to heat, abrasion, breakage and deformation, thus guaranteeing long-lasting, reliable and safe performance when performing tasks Improve Efficiency: Our Copper Tube Flare Bits are available in 5 sizes, eliminating the need for frequent size changes. Its dual function of tube expansion and flaring ensures practicality, greatly reducing time and effort in HVAC projects Easy to Use: The copper pipe swaging drill bit designed with a 1/4 inch hex shank for easy attachment to electric drills. The drill speed should not be too fast Wide Range of Application: This Copper Pipe Expander Swaging Drill Bit Set suitable for most of the copper pipe repairs, including air conditioning, refrigerators, and general copper pipe maintenance Colour:Black Material:Carbon Steel Package Contents: 2 x Tube Expander Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.