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Square drill bit
 
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Square drill bit

 
Metalworking Forum
Last Post by pyth 13 years ago
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 spyghost
(@spyghost)
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http://www.youtube.com/watch?v=ALiqAXiTQBg

http://www.youtube.com/user/thang010146

 
Posted : 19/12/2011 7:28 pm
 pyth
(@pyth)
Posts: 131
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Re: Square drill bit

may be the principle is like this one seen also at youtube..
http://www.youtube.com/watch?v=L5AzbDJ7KYI

 
Posted : 20/12/2011 1:11 pm
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