The description says "Molded jaws bend pipes without deformation." I haven't made wires for the car yet, but I've tested these pliers on a bunch of broken wires, and you can twist and tangle the line with it if you're not careful. The first few corners were ok and then I had a kink. so they are not reliable. What works well for fairly tight 90 degree bends and costs about the same as these pliers is the titanium mini tube bender, which you can also find here at Revain. I bought one of these atโฆ