The Ultimate Spearfishing Knife: Our double serrated edge dive knife is custom made in Italy from from the highest quality 420 stainless steel. This higher carbon steel holds a sharp edge like no other. This blade is so strong it will actually cut right through 480 lb stainless steel cable. The sleek stiletto design is perfect for braining your catch. The double serrated edge means you never have to guess what side to use in an emergency. You can wear it on your arm or leg with the straps that are included or you can attach it directly to your rubber weightbelt. For easy care and maintenance you simply wash in fresh water after each use and remove any surface rust that may occur with a scrounge sponge.