WHDZ Paintless Dent Repair Tool Line Board Reflector Board with Adjustable Holder - Automotive Paintless Dent Repair Tools (Yellow) Its for aligning the reflected lines of the board to a dent.It works best when there is plenty of sun light. The reflection becomes distorted where the dent is and you can then work your PDR tool behind the dent to make the distorted image even or uniform again, once the distorted image or lines become parallel in the reflection you have successfully removed the DENT! Convenient when working outside with a natural light.Note: This product does not have LED lights, suitable for light-filled workplaces. If the light is not enough, please choose LED light board. When using the suction cup, please make sure that the bottom of the suction cup and the contact surface are clean and smooth. Size: 30cm * 21cm; Steady suction arm with a powerful cup for 360 any angle WHDZ Paintless Dent RepairLine Board - Check the dent when you're not sure where is the dent. Packing include: 1pcs Pdr reflector line bord with adjustment holder; We supply Paintless Dent RepairTools for worldwide!!!!