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1/2" electric: [1](4s):install bit, tighten with motor, construction;[2](5s):remove bit with chuck key, constructionSQ无损品质 | 100:14下载 收藏其他(other) / 钻(drill) / 手(hand)
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1/2" 电动: 快速转速的电机, 建设[1](2s);[2](2s)SQ无损品质00:08下载 收藏其他(other) / 钻(drill) / 手(hand)
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1/2" electric: [1](9s):drill one hole, construction;[2](23s):bore one hole, construction;[3](14s):drill several holes, constructionSQ无损品质00:52下载 收藏
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3/8" cordless: drill [1](5s):one hole, construction;[2](16s):one hole, construction;[3](16s):several holes, constructionSQ无损品质00:42下载 收藏其他(other) / 钻(drill) / 手(hand)