The product is an antique set of 3M Speed Wet sanding rubber blocks from the 1930s, featuring advertising imagery. These blocks were used for wet sanding, a technique for achieving a smooth finish on surfaces. The 3M brand is well-known for its quality products, making this item a collectible piece of mercantile history. Perfect for vintage enthusiasts or those interested in the evolution of industrial tools, these blocks showcase a piece of advertising history from the early 20th century. speed-wet as a brand ceased to exist by 1931 Minnesota mining and manufacturing company, later 3m, is the inventor of wet sanding paper in 1921.
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