Mantis GH2022TBS GearheadMantis GH2022TBS Gearhead Folding Knife 3. 38" Black Stonewashed Tanto Combo Blade, Gray Aluminum Handles with Brass Ring, Liner Lock (no box) the GH Series Gearhead folding knife by Mantis Knives. The "steampunk style" Gearhead liner lock folder is equipped with a unique gear driven pivot with one large gear, three small gears and a thumb lever used to deploy the blade when pushed down. It features a flat ground 3. 38" combo edge tanto blade and