Dent repair can be difficult because the dent reflection distorts and is hard to see. However, the ABN Car Auto Paintless Dent Repair PDR Line Reflector Board with Adjustable Suction Cup Arm for Automotive Dents Removal makes dent removal a snap, especially in natural light, as it makes the distorted image even or uniform again. This tool lets you better see the area you are working on to repair car dings and dents. To use, align the board at a 45-degree angle so natural light reflects onto your car, and use the board reflection lines to locate the dent. Use a dent removal tool (not included) to work out the dent. The thinner lines on the board are for detailed work and larger lines for wider dents. Once the lines become parallel in the reflection, you have successfully removed the dent. WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.