3/8 inch, 1/2 inch, or Tube Drive?

Most drills typically come in 2 chuck sizes: 3/8-inch or 1/2-inch. This measurement refers to the width of the connection point between the drill and auger (or drill bit). Most drills will display their size in the fine print on the side of the drill or drill chuck (see pictures). A 3/8 inch drill chuck will ONLY accommodate our 3/8 inch bit offerings. A ⅜ inch auger can function inside of a drill with a larger ½ inch chuck.

For best results, however, we advise against using a 3/8 inch auger with a 1/2 inch hex drive drill when digging in densely compacted soil as a 1/2 inch drill generally has much more torque and could result in damage to the smaller 3/8 inch hex.

Heavy Duty Digging

When you are digging through rough soil with small rocks or dense clay soil we strongly advise using a drill and auger with a 1/2-inch hex drive to increase safety and torque. Additionally the drill should have a minimum power rating of 18 volts or more. For digging wide or deep holes in dense soil a gas powerhead or drill with a 60V power rating is suggested. Most drills will show the power rating in fine print on the side of the drill or on the battery itself (see pictures). 60V cordless drills are generally safer than gas powered units as they include a clutch which prevents injuries. Gas powered units are usually absent of any such safety feature.

Tube Drives

Tube drives are designed for heavy duty applications. They are available for the larger auger sizes and are typically used by professional landscapers. A specialized drill or powerhead with a tube attachment must be purchased. A tube drive auger can be connected to a standard ½ drill chuck with the help of an adaptor.