FC 18-421D 17" Pad Driver Assembly for Factory Cat Tomcat 350D, 52, 5100 Scrubbers which require 8 point clutch plates. A 17" diameter molded plastic brush block with 1/2" short trimmed polypropylene. The short trim poly digs into and holds your floor pad securely to the brush block with the aid of a pad centering device or "pad grabber". This two piece pad grabber is included with the assembly. 17" diameter plastic block with an 8-point clutch plate (Please check your model for the proper number of points. We offer a 6 point and 8 point clutch plate. Use 2-421D for 6 pt.). Designed to hold your 17" or 18" diameter floor pads. Fits Factory Cat and Tomcat 350D (Disc Model), 52 and Tomcat 5100 floor scrubbers. Two pad drivers are required for model 350D, three pad drivers are required for models 52 and 5100. Priced Each. Replaces Factory Cat Tomcat 18-421D, 52-421D. Our Part Number FC 18-421D