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Choosing correct drill bit

I have to use the correct drill bit for a 10mm raw plug . My drill bit only have number on them like 4 or 4.5. Which is the correct size for 10mm
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  • HasbeenHasbeen Forumite
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    One that has 10 on it?
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  • Jeepers_CreepersJeepers_Creepers Forumite
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    Drill bits are usually (always?) shown as actual 'mm' sizes - ie the diameter of the hole they will drill. So, a '10mm' drill will drill a 10mm dia hole.

    Plugs can be a bit more tricky - it depends on whether they are referring to drill size (for the hole) or screw size (the size of screw they will accept).

    So, for these plugs, read the specs again - does it say 'for size 4 screw', or does it say 'drill 4mm hole'?

    '10mm' is a large hole. And that will take a large plug - around the size of a male pinkie (yes, I mean yer little finger...). So, what's this for? How big does the plug look? Finger-sized?
  • Ajmason42Ajmason42 Forumite
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    10 mm seems very large  post pic of the rawplug next to rule  so we can all see 
  • TELLIT01TELLIT01 Forumite
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    Either the strip of plugs or the packet should say what size drill to use.
  • RisteardRisteard Forumite
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    Common sizes are:
    Red rawl plugs (5.5mm drill bit)
    Brown rawl plugs (7mm drill bit)
    Not sure if that helps for what you have.
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  • HasbeenHasbeen Forumite
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    Risteard said:
    Common sizes are:
    Red rawl plugs (5.5mm drill bit)
    Brown rawl plugs (7mm drill bit)
    Not sure if that helps for what you have.
    Think blue is 10mm?
    The world is not ruined by the wickedness of the wicked, but by the weakness of the good. Napoleon
  • fenwick458fenwick458 Forumite
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    red and brown are common, and industry standards. i've seen grey ones at 10mm and 8mm, and blue ones at 8mm and 10mm, so best to just actually measure the plug unless its red or brown.
    a lot of cheap stuff comes from china with the "grey variable size wallplug" that it seems hard to find a suitable drill from my selection, 
    most of time I throw them away and just use my own plugs which I know what size to drill with
  • edited 30 January at 10:07PM
    greyteam1959greyteam1959 Forumite
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    edited 30 January at 10:07PM
    red and brown are common, and industry standards. i've seen grey ones at 10mm and 8mm, and blue ones at 8mm and 10mm, so best to just actually measure the plug unless its red or brown.
    a lot of cheap stuff comes from china with the "grey variable size wallplug" that it seems hard to find a suitable drill from my selection, 
    most of time I throw them away and just use my own plugs which I know what size to drill with
    Yep that's what I do.
    I also chuck the screws away cos they are horrible soft crap.


  • pramsay13pramsay13 Forumite
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    I normally just hold the rawl plug up to the drill bit so you can see if they are the same size.
  • FreeBearFreeBear Forumite
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    Most of the wall plugs that come on a strip will have a gauge hole on the strip so that you can select the right drill bit and size of screw.

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