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Size 207 is commonly used for thicker leather products such as straps, belts, luggage, saddle bags, harnesses, tack repair and footwear. It is also commonly used for webbing and nylon straps. Size 207 is compatible with larger, heavy duty industrial sewing machines which can accommodate larger needle sizes. In terms of appearance, it is more noticeable than size 138 and is a good choice when one is sewing thicker materials and prefers the stitches to stand out, giving a hand-stitched appearance. For more information read our Nylon Thread Buying Guide.