Mantis Bottleneck Blade 3 3/8in. Closed MAN. The Mantis Bottleneck Knife design boasts a bottle opener which attaches effortlessly to any keyring with its integral handle/latch configuration. Specifications for Mantis Bottleneck Blade: Manufacturer: Mantis Knife Application: Folding Blade Blade Shape: Modified Tanto Additional Features: Bottle Opener Quantity: 1 Blade Type: Wicked Dual Tip Age Group: Adults Package Contents: Mantis Bottleneck Blade Mantis MANBK3A: Bottleneck Blade 3 3/8in. Closed