Down Under Kookaburra Fixed Blade Knife Set. Specifications for Down Under Kookaburra Throwing Knife Set: Manufacturer: Down Under Blade Length: 6.75 in Overall Length: 12 in Blade Material: 440C Serrated: Plain Sheath Material: Leather Handle Material: Leather Package Contents: Down Under Kookaburra Throwing Knife Set Down Under DUKKB: Kookaburra Fixed Blade Knife Set