Flatten bumps, bends, and curves on coiled wire with these straighteners. They have roller wheels that apply consistent pressure along the wire for a smooth, straight result. Grooves in the wheels hold the wire in place as you manually move it through, so you don't need a wire feeder. To straighten wire with different diameters, twist the adjustment knob to change the spacing between wheels. The aluminum body resists corrosion from moisture. It's also nonmagnetic, so copper and other metal wire won't get stuck.