Messermeister Mu Bamboo - 6.1/2 Deba Knife - MU-09 The Deba knife is a heavy, wide, wedge shaped, single edge blade with a sloping curve to the tip and looks like a cross between a chef8217s knife and a cleaver. The blade length for small fish is 165 mm and larger fish is 178 mm. It can separate meat from the bone as well as cut the bone, scrape the scales, and cut the head of the fish. It can also cut through the bones and cartilage of poultry.