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Similar to this question diy.stackexchange.com#q136613 but not sure exactly and I still don't know what I should do, so I'm opening a new one.

I have a masonry anchor that is 6x30 and want to drill into brick wall. To make a hole I only have {5/32, 3/16, 1/4} in (IINM, these are 3.97mm, 4.76mm, and 6.35mm respectively) drill bits (Ryobi (homedepot.com). I looked around for awhile at a local Home Depot, browsing as many sections in and outside of Ryobi but couldn't find exact 6mm diameter bit. I also went into rental dept. at Home Depot but they didn't have an exact size of bit either.

I started drilling with 3/16 bit then the anchor doesn't even "sink". Then switched to 1/4 in. bit then the masonry anchor doesn't seem to stick at all as the hole may be too wide.

What should I do? I think of the following but

  • Find exact 6mm bit? I found this (amazon.com) but different brand than my drill (Ryobi), which seems to like hex.
  • Find a drill bit as close as possible to 6mm? Then how big the difference can be?
    • The thread I referred to above seems to handle smaller size diff, so that makes sense for that case. But in my case like I wrote above, 2 bits with I have don't work well.
  • Else

I have a floodlight that I bought from ring.com and AFACT its instruction (booklet, nor online (support.ring.com)) doesn't include any info about the recommended size of equipment to be used.

Masonry anchor that came with the floodlight enter image description here


UPDATE: Thanks for the comments. I was going to try some/all of suggestions, but then I happened to find after a while that in another device I bought from the same manufacturer (floodlight from ring.com) comes with a masonry anchor plug with a very similar size, AND the masonry drill bit 6 mm. So I just used that drill bit and 6x30 anchor indeed fit well. Problem solved for me.

Just to make doubly-certain? when you say at 1/4" the anchor doesn't hold? you did test this with the appropriate screw in place? It won't tighten in until the screw forces it wider.

Good point. I hadn't back then.

The hole I made with 6 mm drill bit is very tight for the anchor, I agree 1/4 inch drill bit might work with the anchor plug tightens once it's screwed.

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    The drill bits you linked to at HD have hex-shanks. Does your drill have only a quick-change hex-shank? If so, then yes, you'll have to stick with hex-shank bits. If it has a "traditional" style 3-jaw chuck, then it can accept any bit at all. Also, whatever type of chuck it has, just because it's a Ryobi drill does not mean you have to have Ryobi brand drill bits, no matter what the marketing seems to suggest.
    – FreeMan
    Commented Nov 14, 2021 at 22:39
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    Just to make doubly-certain… when you say at 1/4" the anchor doesn't hold… you did test this with the appropriate screw in place? It won't tighten in until the screw forces it wider.
    – Tetsujin
    Commented Nov 15, 2021 at 9:03
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    A 1/4" hole really should work fine for a 6mm anchor. That extra 0.35mm should make no noticeable difference.
    – brhans
    Commented Nov 15, 2021 at 17:29
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    You already got it resolved, which is good. My usual method in a similar situation is to go with a smaller bit and after drilling the hole normally, widen it a bit using the same bit and moving it around. Not the best technique (especially to have the bits last a long time...) but in a pinch does the job. Commented Feb 13, 2022 at 23:21
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    I'm glad you got this figured out, but really, you want those plastic anchors to be a snug fit, so you want the hole for them to be a bit smaller than the diameter of the plug, then you hammer them in to ensure it doesn't go anywhere. Especially true for masonry, needs to be done gently if you're going into drywall (or you risk breaking the sheet of drywall).
    – FreeMan
    Commented Feb 14, 2022 at 14:41

1 Answer 1

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From an edit the OP made to his question:

I was going to try some/all of suggestions, but then I happened to find after a while that in another device I bought from the same manufacturer (floodlight from ring.com) comes with a masonry anchor plug with a very similar size, AND the masonry drill bit 6 mm. So I just used that drill bit and 6x30 anchor indeed fit well.

Problem solved for me.

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