About this item IRWIN SPEEDBOR drill bits use a tri-flute design for faster chip ejection and less binding This 1/2-inch drill bit has cutting spurs with 3 cutting edges for faster, cleaner holes A full screw tip allows the drill bit to self-feed for ease of drilling The grooved hex shank helps prevent slipping in the drill chuck or bit extension Fits virtually any standard 1/4-inch quick-change chucks, including impact drills Overview Material: Blend Cutting Diameter: 12.7 millimeters Finish Type: Silver Shank Type: Hex Brand: IRWIN
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