Those people who are familiar with power drills know that it's not an easy task to work with them, especially if the surface is rough. The most common mistake made by nonprofessionals is not enough pressure while they are drilling something. As a consequence, drill starts to wander all over the surface before hitting its mark. So you can spoil a great deal of materials before you'll get the one you need. Fortunately due to the new idea of Bongkun Shin you can forget about this.
His concept prevents any mistakes while drilling, enabling you to make straight and accurate holes. The Smart Guide makes use of two intersected rings that collapse in on each other - keeping your drill straight and on the narrow. It can be perfectly used both by beginners and professionals. Despite the simplicity of this device, it is safe to say that there can be no doubt about its efficiency and usefulness.
Actually I don't understand why something of this kind wasn't designed before. As for the disadvantages of this gadget I would say that most likely it will not be possible to use such a drill in case you need to make a hole in a narrow corner or on a really small detail. Yet, in general it's much better than all its counterparts.
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