Abstract: A screw driver for housing and supplying bits has a housing with a elongate tube extending through the housing along the axis to a forward presentation end of the tube at which the bits are presented for use. The housing has a rotatable storage holder mounted in the housing for holding and storing a plurality of tool bits and arranged by manual engagement with an exposed side portion to rotate about a second axis parallel to the tube. A plunger carried on an end cap with a hexagonal sleeve has a flat magnetic bit carrying face at the forward end and receives a cooperating portion of the housing as a sliding fit. The holder is removable by pressing an ejection button on an opposite face of the housing and has a magnet which holds the bits in place. The plunger is restricted against free sliding movement by a friction head which presses against the side of the plunger.