HHIP 1-1/4-inch X 4-3/4-inch Long Solid Socket With 3MT Morse Taper Hole Made of high-quality tool steel. Solid sockets with Morse taper holes are used to adapt Morse Taper tools to straight turrets. The size of the socket is dictated by the machine it is used on. A larger taper might be a better choice if adapters are available to use a smaller taper in a larger socket.