hi,
i use this kind of Tool
it works very well and comes with 2 different Wheels for 4 / 6 / 8 / 10mm Break Lines (yes, im from the old world :rocker:).
For those who wonder, only 180° where used to bend so 2 Wheels for 4 Sitzes.
Be shure to cut the Lines with a Pipe cutter, a saw will...