Required to drill multiple holes in very hard concrete and increase productivity over traditional hammer drills. I ended up buying an SDS Plus hammer drill, which drills holes in concrete very quickly. I chose the SDS Plus because I've never seen myself drilling holes larger than 1 inch in diameter. I also needed a set of small carbide concrete drill bits that I could easily throw in my tool box. . I drilled many holes close together without damaging any drill bits or the carbide end. The groove design also does a great job of removing all the dust from the bottom of the hole. This set includes 5/16", 3/8", 1/2", 3x (2 long, 1 short) 1/4" and 3/16" bits. If your punch supports SDS Plus bits, they fit perfectly. Highly recommended!
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