Drill bit

A drill bit comprising:

• a shaft having a first end portion connectable to a power tool and a second end portion opposite the first end portion, the shaft defining a longitudinal axis extending through the first and second end portions;
• a first generally planar blade coupled to the second end portion of the shaft and defining a first cutting edge extending radially from the longitudinal axis;
• a second generally planar blade coupled to the second end portion of the shaft and defining a second cutting edge extending radially from the longitudinal axis, the second blade being spaced apart from the first blade about the longitudinal axis;
• a third blade coupled to the second end portion of the shaft and defining a third cutting edge extending radially from the longitudinal axis, the third blade being spaced apart from the first blade and the second blade about the longitudinal axis;
• and
• a cutting spur coupled to an end of the third blade substantially opposite the longitudinal axis, the cutting spur extending axially from the third cutting edge.

A drill bit comprising:

• a shaft having a first end portion connectable to a power tool and a second end portion substantially opposite the first end portion, the shaft defining a longitudinal axis extending through the first and second end portions;
• a first generally planar blade coupled to the second end portion of the shaft and defining a first cutting edge extending generally perpendicularly from the longitudinal axis;
• a second generally planar blade coupled to the second end portion of the shaft and defining a second cutting edge extending generally perpendicularly from the longitudinal axis, the second blade being spaced apart from the first blade by approximately 180° about the longitudinal axis;
• a third blade coupled to the second end portion of the shaft and defining a third cutting edge extending generally perpendicularly from the longitudinal axis, the third blade being spaced apart from the first blade and the second blade about the longitudinal axis;
• a fourth blade coupled to the second end portion of the shaft and defining a fourth cutting edge extending generally perpendicularly from the longitudinal axis, the fourth blade being spaced apart from the third blade by approximately 180° about the longitudinal axis;
• and
• a pilot tip extending from the third blade and the fourth blade generally along the longitudinal axis.