Eccentric Flaring Tool

Here is the link to the flare tool:

https://www.amazon.com/Wostore-Eccentric-Aluminum-Refrigeration-Applications/dp/B07LDY4Y2D

I asked ChatGPT how far and it replied with a table of how far the tubing should extend past the flare tool surface:

Practical guidance by tubing size For typical HVAC/refrigeration copper tubing (Type L / ACR):

Tube OD Typical protrusion 1/4" ~1.0–1.3 mm 3/8" ~1.2–1.6 mm 1/2" ~1.5–1.8 mm 5/8" ~1.6–2.0 mm