Joker Black S/A OTF Automatic Knife Satin Dagger Serrated. When you push the button the blade pops out the front and you have to manualy retract the blade back in to position. These are a very rare find. We only have a few in stock. Specifications: Overall Length: 8.25 Inches Blade Length: 3.5 Inches Blade Material: Stainless Steel Handle Length: 4.7 5 Inches Handle Material: Aluminum