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18mm Snap-off Blades by HEIKIO, 50-Pack, Quality Black Carbon Steel Made, Sharp and Durable, Heavy-duty Replacement Blade for 18mm Box Cutter and Utility Knife - Amazon.com
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DOWELL Utility Knife Box Cutter Retractable Self Loading Heavy Duty Snap Off Quick Change Extra Blades(3PCS) TPR+PP Handle Cutting Cardboard Boxes or DIY - Amazon.com
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