AKC X-Treme Shadow 11" Abalone Stiletto Automatic Knife 440c Bayo. To unlock the blade, simply press the top bolster upward, and the same action is repeated for closing it securely. Overall length: 28cm – 11" Blade Length: 11.5 cm – 4.53" Blade thickness: 3mm - 0,12" Weight: 130 gr-4.59 oz Blade Material: 440C Steel mirror Handle Material: Abalone