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  1. #1
    Senior Member
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    Mar 2005
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    195

    eBay Diamond Hole Saws...

    Hey,

    Has anyone on here ever ordered/used these hole saws from eBay Hong Kong?

    http://cgi.ebay.com/60mm-Diamond-coa...QQcmdZViewItem

    Please let me know if you have and how many holes you can drill with one bit?

    Thanks,
    Matt

  2. #2
    Moderator Krugar's Avatar
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    Jun 2004
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    I have no idea how long they last, I've only ever drilled my fuge.

    My biggest concern is that the price is about the same as what I paid for the dremel bit I used to drill a 5G tank. Mamma taught me an offer that sounds too good to be true probably is.

    Given what I've heard other people say they pay for these things, he's charging less that 1/6th the price. I'd want a good answer for "why" before proceding.

    I'm told how long they last is as much luck as use. It could become "dull" after the first use, or the 50th. Using a dull (is that the right term?) bit breaks tanks.

    YMMV... OSD & liv are both drilling waaaaay more than I. Hopefully they will chime in.

    Cheers!
    There is nothing so permanent as a temporary measure.

  3. #3
    Moderator cres's Avatar
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    Jul 2004
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    I have a couple of these. They are not top end quality. I noticed a significant change in the grit from only one hole in 1/4" glass. Glass, like many things, has hard spots and impurities, so, one hole might wear out a bit, where other glass or locations might last many holes.

    If you are planning to drill 3-4 holes, I would get two bits. They should be able to manage 2-4 holes each, but, if you need 4 and you get 3 ...

    There are better quality ones out there, but, expect to pay more like $50 to get them.
    Sarchasm: The gulf between the author of sarcastic wit and the person who doesn't get it.

  4. #4
    Senior Member
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    thanks for the replies, i figured as much in terms of the quality, but then again, i could order approx. 10 to 1 of these over the high quality ones and get a ton of holes out of them.

    quick question: ... for a 75G tank, would you guys drill the back or the bottom? what are the advantages and disadvantages of both?

    thanks,
    matt

  5. #5
    Moderator Krugar's Avatar
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    Do you know if the bottom is tempered or not? That tends to be the piece that is & you can't drill tempered glass. Other than that IMHO it depends on what's going to be easier for your set up.

    A bottom hole will need a box & a stand pipe, a hole through the back may not need as much. Neither method is more "correct" than another, go with what's going to be easiest.

    Cheers!
    There is nothing so permanent as a temporary measure.

  6. #6
    Senior Member
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    Mar 2005
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    I will have to check if it is tempered or not... I would prefer to drill the bottom mainly for looks, but I drilled my 29g in the back and that worked well also...

    decisions... decisions.

  7. #7
    Junior Member sasquatch's Avatar
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    Sep 2006
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    There are two other important considerations in locating holes. hole should not be located less than 1 diameter from edge and if in a corner DO NOT drill same distance from each edge one MUST be more than the other or the corner will break off

  8. #8
    Senior Member
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    Mar 2005
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    well instead i just decided to go buy a predrilled 90 gallon all-glass with mega-overflow. very nice tank for $239.99 + tax at Big Als. They are on sale.

  9. #9
    Senior Member ak_sniper's Avatar
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    Sep 2004
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    Nice purchase, im thinking of maybe going with a 90G or bigger for my next tank.

    Does it just have holes in the bottom for the overflow ?
    20G Reef Tank (Starting again...)

  10. #10
    Senior Member
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    Mar 2005
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    it has two holes in the bottom within the overflow chamber...

    then the overflow accessory kit is $90 for all the plumbing and durso standpipe etc...

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