This vented backing plate is a performance upgrade to your corded 6" Random Orbital and cordless 5" Lithium-Ion Random Orbital. It's a win-win as our exclusive heat management system with vertical and horizontal cooling ports delivers smoother operation, longer pad life, and better results. The plate features firm yet flexible high-density urethane foam with chamfered edges for flexibility and improved contouring over and around body panels. The plate's center recess further reduces heat transfer. The Velcro® brand Micro-Hook attachment is optimized to create the perfect balance between strong pad engagement and easy disengagement. Plate also has rotational speed markings for optimum pad speed control.