TCT ALLOY HOLE SAW KIT. 6PCS:22mm,30mm,35mm,45mm,50mm,65mm. Applicable materials: stainless steel less than 4mm, aluminum alloy, iron, angle iron, cast iron less than 20mm Precautions: 1. Check whether the center drill is tightened, turn on the machine and check the concentricity of the hole saw.
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