The TDI Pocket Strike from Ka-Bar, was designed by Tactical Defense Institute's Renowned John Brenner. The objective of the Pocket Strike was to create a strong fixed blade, that could be easily concealed, convenient to carry, and quick to deploy in a close quarters combat scenario. Studies show that during conflict, the human body loses most fine motor control due to adrenaline, and stress, in favor for more "gross" movements, and brute force to fight off an attacker. Because of this John Brenner designed this knife to be as ergonomic as possible to work well when motor skills are diminishing. The ring on the end of the handle is used to quickly and safely draw the knife out of the concealed carry hard plastic sheath. The 3.1" AUS-8A stainless steel blade is extremely durable, and can take a razor sharp edge. The Sheath is designed to be concealed in the pocket, but could easily be carried inside the waistband as well.
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I thought this was a bad design at first as the pocket clip has no where near enough retention to stay in your pocket when you pull on the knife. After breaking it in a bit I learned that you can use the curves on the sheath of the knife to hook onto your pocket like an emerson wave, leaving the sheath in your pocket. Takes some practice like any wave but very smooth when broken in.