Sep 26, 2014 · Sep 29, 2014. #3. One of the selling points for the What-A-Saw over the Sven saw was that it uses standard 21" bow saw blades, while the Sven uses a proprietary blade. My What-A-Saw came with a wood blade and a bone blade. Both are 20 3/4" overall, with hole spacing of 20" centre-centre.
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