KA-BAR Knives USSF, TDI Astro MP, Fixed Blade Knife, 2.313 Blade Length, 5.625 Overall Length, Blue Zytel Handle, AUS 8A Stainless Steel, Hard Plastic Sheath w/ Reversible Belt Clip 1480SF The TDI Astro MP brings a fan favorite on Earth in to orbit. The Astro MP includes a gray hard plastic sheath with belt clip to keep your knife from floating away. Ideal for opening freeze-dried food" mail from home" repairs to the ship" and self-defense.