Porter Cable 846724 Sander Felt Pad. This felt pad is used on sander. This part fits model number 330.Dimensions: 4-1/4-Inch by 4-1/8-Inch. 3-Inch long, 3-Inch wide, and 2-Inch high. Package weight of this item is 2-Pound. Porter-Cable is a brand with a proud history of innovation and has brought many firsts to the power tool industry. The company designs, manufactures and distributes electric and cordless power tools, pneumatic tools and compressors, pressure washers, generators and related accessories for the professional woodworking, commercial/residential construction, plumbing and electrical markets.