I purchase the K Tool International KT-70080. The instructions in the box are clear and work well. I've done 3/8 steel fuel lines, and 5/16 brake lines. Also use it to form "bumps" on lines to slip rubber hose over.
1. Cut line to length with cutter or small grinding wheel.
2. Smooth cut edge flat with fine file.
3. Chamfer ID with reamer and file OD to slight chamfer.
4. Slip on fitting.
5. Tighten in tool per instructions.
6. Lightly oil die, and form in two steps as per instructions.
And Jegs NiCopp brake line is real easy to work with.
