Walter Quick-Step Blendex™ Non-Woven Surface Conditioning Disc, 4-1/2 in dia, Medium Grade, 11000 RPM Maximum, Hook and Loop Attachment, Maroon, Applicable Materials: Aluminum, Stainless Steel and Steel. Walter Surface Technologies Quick-Step Blendex™ 07R453 07-RNon-Woven Surface Conditioning Disc, 4-1/2 in dia Disc, Medium