MANBK3B Mantis Knives Bottleneck Latch-LockThe BK 3B Bottleneck is a compact 3. 38" closed folding knife built around a practical bottle opener and dual tip 420 stainless modified tanto blade. Its patented Latch Lock mechanism with integrated handle springs delivers reliable deployment and secure lockup in a EDC sized package. The pocket clip and modest blade length make this a legal, low profile carry across Europe, ideal for users who value utility features alongside everyday cutting tasks.