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1/2" hammer drill: [1](2s):quick rev of motor, construction;[2](2s):quick rev of motor, construction;[3](24s):drill hole into concrete, constructionSQ无损品质 | 300:35下载 收藏
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3/4" hammer drill: [1](11s):rev and small hole into concrete, construction;[2](15s):drill small hole, sev. attempts, construction;[3](10s):drill hole into concrete, constructionSQ无损品质00:43下载 收藏