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handmade grinding head cutting head (twist drill bit grinding video)
生活视频老师傅教你怎么磨钻头,这样磨出来的钻头跟新买的一样好用。手工磨标准麻花钻头一平整的砂轮一台二从刃口往后磨,防止钻头退火,...
2021-10-21 01:31:02
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