A Morse Taper Shank drill incorporates a standardized taper shank design that is used in tapered drill chucks. The Morse Taper was invented by Stephen A. Morse (also the inventor of the twist drill) in the mid-1860s. Morse Tapers come in eight sizes identified by number between 0 and 7. Often this is abbreviated as MT followed by a digit, for example a Morse taper number 4 would be MT4. The MT2 taper is the size most often found in drill presses up to 1/2'' capacity.