This compact knife seems to offer a practical solution for freediving and spearfishing, emphasizing convenience and versatility:

Specifications:

Total Length: 16cm (including scabbard) - a compact size ideal for mobility and ease of use underwater.
Blade: Constructed from stainless steel 420, featuring both smooth and serrated edges - a versatile choice catering to different cutting needs underwater.
Easy Release Device: Facilitates quick and effortless access to the knife when needed, adding to the convenience during dives.
Mounting Options: Designed to be fixed to the arm, forearm, belt, or calf - providing multiple attachment choices to suit individual preferences or diving gear configurations.
The knife's compact size, coupled with its stainless steel construction and varied sharpening options, makes it well-suited for diverse applications in freediving and spearfishing. Additionally, its adaptable mounting options offer users flexibility in choosing the most convenient attachment point based on their diving setup.