Coupling apparatus for a rotary hand tool

A ferrule for coupling an attachment to a rotary hand tool of the type that has a housing with a nose portion through which a rotary output shaft extends, with the nose portion having a pair of outwardly extended elongated teeth, wherein the teeth axially extend along a circumference of the nose portion approximately 90 to 100 degrees so that a groove portion is located on opposite sides of the nose portion, said ferrule comprising:

• a generally hollow cylindrical body with an open mounting end portion and a smaller opposite end portion to which the attachment is mounted, the open mounting end portion fitting on the nose portion of the housing when the ferrule is coupling to the rotary hand tool;
• at least one internally protruding rib on said interior surface for aligning the ferrule in at least one predetermined angular position;
• and
• at least two latches mounted on said ferrule, each of said at least two latches having an open and a closed position wherein said ferrule is locked into the nose portion when said latch is in said closed position, wherein each said at least two latches further include a projection for engagement of the groove portion.