In the closed position the Rite Edge Martrix knife is 4 1/2" long. The blade is a blackened stainless steel with a quick assist thumb knob for quick and easy deployment of the blade by its user. Once extended the blade is held open by a locking device concealed inside the contoured handle which is easily released by the users thumb. The knife also has a convienent clip on one side for easy carry. The handle is secured by three hex head screws for easy disassembly if needed.