The Scubapro Mako 3.5" Dive Knife made from 304-grade hard-tempered stainless steel, it offers good resistance to surface oxidation, ensuring durability and longevity. Its conventional edge slices easily through numerous materials, while the serrated edge tackles heavier ropes and branches. The line-cutting notch handles small ropes and fishing lines efficiently, and the built-in bottle opener provides after-dive convenience. Equip yourself with this versatile knife for a safe and enjoyable diving experience.