These wicked looking objects are actually 7-1/4″ saw blades from Smartman Tools. Used for roofing repairs, they’re designed to cut through roof decking — shingles and all. Presumably because of their unique design, Smartman Tools claim they last longer than their competition’s blades.
Designed for cutting through three layers of shingles or tar and gravel roofs, the three winged 3x RipBlade can cut over 7500 linear feet without clogging. Under a little less harsh conditions, say only two layers of shingles, you might want to switch to the five winged 5x RipBlade which goes a little longer without clogging. Both blades can be resharpened.
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