Blade is protected by a safety guard. Guard slides back when pressure is
applied exposing blade to cut through materials. Once you lift the
cutter from the surface, the guard slides back into place covering the
blade and providing protection. No button to engage or release blade! It
does it automatically. Always use a rotary cutting mat to protect not
only your surface, but your blade! CAUTION-blade is extremely sharp. For
best results, use with the Dritz 45mm rotary blades. Most other 45mm
blades will work with this cutter.