Holmatro Levitin PSP40

NEW EXTREME GRIP SPREADER TIPS
Unique design with pointed teeth at both sides that bite into the material.
The middle row of teeth on the inside of the tips is taller and offers instant
grip. The teeth on the outside alternately point in the opposite direction,
to prevent the spreader from slipping away. This allows for a superior
grip over the full spreading range. Finally, the interlocking profile results
in smaller insertion dimensions.