The One-Handed Trekker is a three-layer 111mm SAK with linear-locking blade that can be opened one-handed using an opening hole in the main blade. It also has a strong locking flat screwdriver (inline) and a philips screwdriver in the back layer. The OHT was introduced by Victorinox in 2003. This particular model was produced after 2007 when Victorinox re-designed the linear locking mechanism and changed the geometry of the OHT opening hole to make it more rounded. This is the civilian version of the 2008 model Soldier's knife. The only difference is that this model has the black nylon scale versus the one in the Soldier which has the embossed sections for better gripping.