IRWIN Speedbor MAX Auger Drill Bit Set - 3 Piece, New in Package. 

• Full screw tip allows bit to self-feed
• Tri-flute design for faster chip ejection
• Grooved hex shank prevents slipping in drill chuck or bit extension
• Fits all standard 1/4" quick change chucks
• Bit sizes included: 5/8", 3/4", and 1"