Microtech HALO V automatic OTF knife. This Microtech HALO Automatic OTF knife is the new larger version with an overall open length at 10 3/4" with a 4 1/2 blade, and is 6.25" closed. Get your's today from an authorized Microtech knives dealer. They're bigger and better! The Microtech H.A.L.O. V is a single action automatic opening - out the front - knife that will provide the one handed, fast action open that has fired its way into the hands of thousands of military, law enforcement and government agents all over the world. The Halo V, when deployed, provides the absolute tightest lock up of any commercially made front openers availailable.