* Bore 2 times faster,, last 3 times longer * Micro-groove point and cutting edges with extended spurs for faster,, cleaner boring action * Forged in one piece from Irwin’s own special grade tool steel * Heat-treated full length for extra overall strength * For 1/4” and larger electric drills * 88804: 1/4” * 88805: 5/16” * 88806: 3/8” * 88807: 7/16” * 88808: 1/2” * 88809: 9/16” * 88810: 5/8” * 88811: 11/16” * 88812: 3/4” * 88813: 13/16” * 88814: 7/8” * 88815: 15/16” * 88816: 1” * 88818: 1-1/8” * 88820: 1-1/4” * 88822: 1-3/8” * 88824: 1-1/2”

 

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