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120mm drill bits

I hope you're not planning to use this with your Harbor Freight cordless drill. LOL.

This looks to be a specialized bit for use in a vacuum or magnetic hole saw and to be used in glass, marble, etc with a water lubrication system.

I assume you want to drill a hole for a fan?? Make a template and use a jig saw with a fine tooth metal cutting blade.

http://cgi.ebay.com/Electric-JIGSAW-jig...60QQcategoryZ20786QQrdZ1QQcmdZViewItem

When you're done use a sanding drum in a drill to smooth it out.

 
Well i'm not using a cordless drill...

Yes, its for 120mm fans... And a few of them.

The problem is I don't own a jigsaw and a fine tooth metal blade AND a sanding drum... Instead of spending all that money i'd rather buy the 120mm bit. Surely to goodness it can drill a few holes in an aluminum and steel case.

What do the rest of you think...
 
A 120mm drill bit would be rather unwieldy. Do you mean a hole saw?

Do you know a friend with a drill press? If so, you can go with something like this.
 
you need to find a 4 3/4 inch hole saw. They sell them at almost any hardware store. Make sure you also get a pilot bit, or a pilot guide so u cut the hole evenly and not drift off while cutting.

Also it helps to clamp a piece of wood over the hole your trying to cut to work as a guide on metal. Another trick i usually use is WD40. Spray a little to keep the saw lubricated and then cut.

PS. MAKE SURE U WEAR SAFTY GLASSES WHEN CUTTING METAL!!! the shards are sharp and if u get one in the eye it could mean VERY VERY BAD NEWS!!
 
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