The spiral-ratchet screw driver here illustrated is Intended for electrical workers, cabinet makers, carpenters, boat builders and mechanics having a large number of small screws to drive, and where a light weight tool will be more sensitive and convenient than the standard pattern.
It is small enough to be conveniently carried in the pocket, measuring 7 inches long when closed and without bit, and weighs complete less than 7 ounces. It drives screws in or out and holds rigid when closed or extended. The bits are straight, so they can be used to drive screws through holes in insulators, etc., where the flattened pattern of blades, etc., will not pass through holes. It has attachments of chuck for holding drill points and countersink.