When you're ready to buy, don't just grab the first shiny blade you see. Professional finishers look for these specific traits:
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A key feature is the distance from the shank to the blade edges. A shank that is perfectly positioned allows you to "feather" (blend edges) without the blade digging in, while still being stiff enough to "float" (level out) heavy mud or plaster. When you're ready to buy, don't just grab