The essential folding knife for professionals, SOG Vision XR features a 3.18 inch cryogenically heat-treated CTS XHP stainless steel Tanto blade for increased strength and general purpose use, and ultra-grip G10 handle. SOG’s XR Lock® enables smooth ambidextrous single-handed opening in three different ways with innovative solid blade-lock once open delivering fixed-blade-like feel and confidence. The SOG Vision XR pocket knife is at the peak of performance and capability. Rarity Note: This SOG/SIG SAUER collaboration knife was only available to SIG SAUER Legion Members that purchased a SIG SAUER firearm. Therefore, very few are known to exist today.