I use DEWALTs DEWALT DW4865 9-Inch 10TPI Demolition Bi-Metal Reciprocating. They are made for Fire and Rescue and my local Hardware store sells them. I cut a full size school bus apart with only 5 of these blades. that was cutting it down to fit in my 6'X10' trailer. It was a lot of cutting and these blades proved themselves to me. I buy them 10 at a time now and always have them on hand.
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