Portable drill guides essentially turn a handheld drill into a small drill press. The drill attaches to a shaft that is connected to a chuck, which is guided in a straight line on two rails. The angle of the guide can be changed in relation to the workpiece, and most also feature a depth stop. It's a great tool to have if you don't have space for a full-size drill press or if you need to drill angled or repetitive holes when your drill press is either inaccessible or won't work for the application. The problem with most drill guides, however, is they tend to be a little flimsy and not very precise. The Rockler Portable Drill Guide has all of the features of previous drill guides, with the added advantage that it is also built like a tank. A large 1/2"-capacity Jacobs chuck glides amazingly smoothly on ball bearings.
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