2 Edge Cleaning Brushes (Edge Brushes) for Roomba 500/700 Series Compatible with blue side brush module models of the 500, 600, and 700 series. Compatible models: 510 527 530J 531 537 538 550 551 560 561 570J 577 620 621 622 623 624 625 626 627 628 629 630 631 680 690 760 770 780 790 etc. Please note: These are NOT compatible with the gray side brush module models of the 600 series (e.g., 606, 641, 642, 671, 691, 692). I used one from a set of 3, but I'm selling them because I got rid of my Roomba. They don't appear to be genuine. Screws are not included. Please refrain from purchasing if you are sensitive to items that have been stored for a while. Thank you for looking.