Sürbisa 61655 Sürmene Doner Knife Length: 55 cm Width: 4.5 cm Thickness: 2.5 mm Plastic Handle Dimensions Handle Excluded. CLEANING: After using the knife, we recommend washing it with warm soapy water and drying it with a dry towel. Many food items contain acid (fruits, vegetables, meat, etc.). Food particles remaining on your knife will corrode the blade and may cause these worn parts to oxidize or even rust. Knives should be washed by hand and kept dry.