Irwin 49918 I-100 1-1/8-Inch Auger Bit

Solid center design provides extra rigidity while boringWide lands keep the bit straight as it bores through the hole. The flutes are ground behind the lands to funnel chips to the inside of the bit and away from the outside diameter, producing a faster, cleaner cutSingle-spur cutting edge scribes the circumference of the hole for a smoother finishCoarse screw point provides fast boring in hard and soft woodsAll bits have a 4-1/2″ twist length and a 7-1/2″ overall lengthFull-length heat treated bit guards against bending in heavy-duty applications and strengthens the twist where the greatest strain occurs
Diameter: 1-1/8″ Shank Size: 7/16″