请教这个东西有必要买吗？Costco - DREMEL 300 series kit with 24 pieces

bigbowl

Costco - DREMEL 300 series kit with 24 pieces :: 34.99$ (usually ~90$)
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红旗网上还挺hot的，好像只能打磨吧，还有什么功能？谢谢！
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