if this helps..... i cut this sign with a spiral blade (and my saw is only 16'') the sign is 21'' by 14''. I first tried a regular blade and only got 5-8'' then it hit the neck, changed to spiral and BINGO , I've been sawing for 11 months and thought I would never be able to use a spiral blade, all you have to do is go slow and practice practice practice, also the right tension and speed also is a factor because the blade will walk with you more easy....just my two cents worth.