Get AO 50 Cal Bullet Knife Stainless Steel Assisted Opening Assisted Opening 50 Caliber Bullet Knife. Looks just like a real 50 Caliber Bullet. Closed Length: 5-1/2", Open length 9-1/2". Blade Length: 4". Blade Material:Stainless Steel. Casing is heavy duty Solid Stainless Steel.