The 1/4 shank makes these abrasive wheels suitable to be used as sanding wheels for electric drills, cordless drills, die grinders. Flap Wheels Set - 7 Different Sanding Sizes - 1/4 Shank Fits All Drills- 4 pcs of each 40mm 50mm 60 mm.8 pcs of each 30mm 25mm 20mm 16mm.
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