Constructed of M-42 8% cobalt high speed steel for super abrasive resistance on tough metals. Heavy duty spiral flute design produces faster chip ejection. Shorter cutting lips reduce torque for drilling high tensile strength materials. The 135 degree split point reduces feed pressure to facilitate penetration without work hardening. Ideal for use with screw extractors. Size: 1/8". Twist. Length: 1-5/8". In general. Length: 2-3/4".