This Swiss Tech 18mm Snap Off Knife made of aluminum for high durability. Features smooth slider mechanism with self locking feature for security. Snap off blade to maintain a sharp and fresh cuts.The Swiss Tech Professional Safety 18mm Utility Knife with Self Locking Feature For Security is stronger than traditional 18mm utility knives to satisfy most cutting jobs. The blade has ultra hardness, edge retention and sharpness, which is sufficient for a range of tough uses. It adopts an autolock slider to adjust cutting depth The wraparound handle is in right weight and non-slip while maintaining strong in the harshest environments.