The Crain Part No. 1505-D Bumper & Screws (4) is a replacement thin bumper designed for use with Crain knee kicker tools, particularly models like the No. 505 Econo Knee Kicker (old style) and No. 600 Knee Kicker (old style). This bumper is made from durable rubber and comes with four screws for easy installation. It serves as a direct replacement for worn or damaged bumpers, ensuring optimal performance and impact absorption during carpet installation. The 1505-D is specifically listed as the replacement thin bumper, while the 1600-Q is used for the thick bumper variant.