With its quick-change mechanism, OLFA's Quick-Change Concealed Blade Replacement Head makes switching out blades safe and easy allowing for uninterrupted workflow and minimizing downtime on the job. This pack of ten replacement heads is for use in the OLFA SK-16 Quick-Change Concealed Blade Safety Cutter (sold separately). The premium stainless-steel blade with wider cutting channel tackles a variety of tough materials. In head-to-head testing, the OLFA blade cut over 7x more single-wall corrugate than the leading competitor. The quick-change blade release system offers simple and efficient blade changes. Pull back on the red button to release and remove the used blade. Insert the new blade and click into place. The replaceable blade head reduces waste compared to disposable models.