The Precision Twist Drill R51 taper length drill is easy to use. This part has a 27/64 in diameter. Designed for right hand cut applications. Has a 4 5/8 in flute. This taper length drill is made of high-speed steel with a bright finish. Has a R51 configuration. The overall length measures 7 1/4 in. This taper length drill meets the following standards: ANSI. Packaged 6 per pack.