Product Description: The 391-163 is a premium 55° drag knife blade specifically engineered to process heavy-duty substrates on Summa digital plotters and flatbed systems. Precision-manufactured from high-density tungsten carbide, this blade offers the extreme hardness required to maintain a razor-sharp edge while cutting through abrasive or dense materials that would quickly dull standard steel blades.

Designed with a high-offset swivel geometry, the 391-163 is optimized for "swivel" cutting, where the blade rotates freely within the holder to follow the tool path. This design ensures that the knife remains firmly pressed into the substrate even when navigating sharp corners and complex curves, preventing lifting or material snagging. With a maximum cutting capacity of 0.80 mm (0.03"), it is the definitive choice for industrial sandblast applications, thick floor laminates, and heavy-gauge specialty vinyls. This blade must be used with the Summa Thick Materials Blade Holder (391-363) to ensure proper mechanical stability and depth control. Whether utilized for architectural stonework masking or heavy-duty industrial decals, the 391-163 delivers the professional-grade, burr-free finish required for high-performance digital finishing.

Summa OEM-Quality tungsten carbide Blades at Wholesale Prices