Square Hole Drill Bit 

The square hole drill bit is also known as the Mortise Chisel Drill Bit. It can make the job of constructing a home much easier by letting you make a smooth-walled square hole in virtually any material.

Luckily, the Mortise Chisel Drill Bit is a specialized item. Those who prefer to do their construction work by hand will find it a little more difficult to get the job done. But, you'll save yourself the hassle and expense of purchasing tools that aren't necessarily necessary.