Lansky Double-Sided Diamond Folding Paddles offer two full surface diamond sharpeners in one compact unit, a medium grit for everyday sharpening and a fine grit to finish an edge.Both double-sided models have the same folding convenience and rubber over-molded handles and are the same size as our single-side folding diamond paddles. (3.625'x 0.8125'/9.2 x 2.1cm)