The VERTEX K50 is a great value spearfishing knife.  420 stainless steel blade.  Strap it to your leg securely in it's sheath with leg straps included.

Features includes:

• Made from marine grade forged 420 stainless steel for extra strength and durability.
• Stiletto 110mm blade - serrated cutting edge plus bone cutter.
• Extra tough polycarbonate sheath with a rubber locking toggle. Includes rubber straps but can also be attached to your weight belt.
• Knife handle is shaped perfectly for the hand.

Note: As with most dive knives 420 stainless steel will always hold an edge but can be susceptible to surface rusting if not cleaned correctly after diving.