Tool set with drill bits + copper tube extension for screwdriver or drill, drill bit set for press tool, 6 pieces

Material: Steel bearings. It has high hardness, uniform wear resistance, and strong elastic limit. Pressing tool: A product of the pressing process, this tool is used in the installation of HVAC system lines. Function: When air conditioning is installed, it stretches the copper pipe, creating a mutual connection between two copper pipes. (Installation on a hand-held electric drill) Easy to install: Perfect for installers, whether you are a beginner or experienced. Multiple sizes: 7/8", 3/4", 5/8", 1/2", 3/8", 1/4" - 6 different sizes to choose from to meet your needs.