Abstract: A folding knife apparatus has an elongated handle with a slot formed therein. A knife blade has a working edge and an edge opposite to the working edge also has an abutment portion on one end of the opposite edge. The blade has a storage position wherein the working edge is disposed in the slot and a working position thereof approximately 180 degrees from the storage position thereof wherein the working edge extends out of the slot. The knife blade is pivotally attached to the handle along a first axis for permitting movement of the blade between the storage and working positions thereof. A lock member is rotatably attached to the handle along a second axis and has a locked position and an unlocked position. The lock member is in engagement with the abutment portion of the opposite edge of the blade when the blade is in the working position and the lock member is in the locked position thereof. The lock member is spaced from the blade abutment portion when the lock member is in the unlocked position thereof.