Line Board Reflector Board is a good helper for dent removal, and works best in plenty of sunlight or bright places. Description: Widely used in the detection of car dent repair.This tool lets you better see the area you are working on to repair car dings and dents.It also suit for all kinds of metal surface,such as auto, motorcycle, refrigerator, washing machine etc. Line Board and adjustable holder are made of strong PVC composites,not easy to break, it can be bent freely and it is good operation. How to use it? 1.Clean the surface of the detection area. 2.Secure the adjustable holder between the car body and the line board,and then adjust the adjustable holder,so that natural light reflects onto car,and dent is located where reflected lines are distorted. (Tips:let the board at a 45-degree angle,it will work better.You also can adjust the angle according to the position of the dent on the surface of the car) 3.Use dent repair tools to work out dent.With line board test again,once distorted image or lines becomes parallel in reflection, it means that you have removed dent successfully. Product Includes: 1 × Reflector Line Board 1 × Blue Holder This Line Board Reflector Board has been professionally tested,it is lightweight,durable,colourful and highly recognizable,no external power required.