An improved injection mold for molding an information recording disc is provided. It includes a holder frame fitted to a mold fitting plate, a mirror platen member for a stamper held in the holder frame, a tubular inner periphery holder fitted into a central hole bored through the mirror platen member and provided with a threaded portion on the outer periphery thereof near the leading end, a pilot bush and an anchor nut for holding the inner periphery holder, and is characterized in that said inner periphery holder is provided with a screw section having a plurality of intermittently disposed threaded portions projecting forwardly from the leading end thereof and said pilot bush is provided at the leading end thereof with a locking flange having at areas close to the center thereof through holes for allowing respective threaded portions to run therethrough and project further while the mold fitting plate is provided in the inside with an rotatable anchor nut so that the inner periphery holder can be firmly secured to the mold fitting plate through screwed engagement of the anchor nut and the threaded section can be made to abut the corresponding surface of the locking flange.

A tool for use in connection with a wall covering material source having a nozzle to dispense wall material to be applied to a wall. The has a plate having a front surface, and a back surface which is adapted to slide along the wall surface. The back surface defines an opening, and the plate defines a passageway passing through the plate and coupled to the back surface opening. A tube connected to the front surface of the plate and coupled to the passageway of the plate is adapted to receive the nozzle of the wall material source. The plate passageway directs the wall material dispensed from the source nozzle to the back surface opening to be delivered for application to the wall surface.