I personally find it very difficult to drill straight holes. This guide has certainly solved that problem. Holes are drilled to perfect size and well marked. The guide is exactly 2.5 cm thick, which makes it easy to calculate the depth. I also really like this pattern because it's one of the few that has 1/4, 1/2, and 5/8 on the same pattern. The only downside I found was the tapering of the lead. The guide is much thinner at the small hole end than at the big hole end. So if you align the top edge of the guide, the top edge of each hole will be the same distance from the edge of the guide. It would be much more useful to me if the center of the holes were exactly the same distance from the edge of the guide. This is a small issue that makes a big difference for me when trying to measure and publish this guide. I would really like this guide if I could clamp it down and know that my hole would always be 1/8 inch above the top of the guide for example. A small issue, but for me it makes a huge difference in ease of use and speed of use. Conclusion: This is a very good guide. The design of this guide wouldn't bother me that much, otherwise it's not a perfect tool.
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