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Questions tagged [drill-bit]

57 questions
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3 answers

What does the colour of drill bits mean?

I bought this set of drill bits. The set came with 3 colours of drill bits: Silver Gold and Black I do not know. What does each one of these bit colours mean?
asmgx
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15
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11 answers

Is it safe to use a drill bit with a half broken tip?

I broke the tip of the masonry drill bit. The tip looks like this now. Half of it is missing, and it seems that the tip itself moved slightly towards the center (since at the bottom, it is parallel to the shaft). Is it still safe to use the drill…
Arseni Mourzenko
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14
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11 answers

How can I drill through small thin hardened steel wrenches?

I have a couple wrenches that came with my mini air powered die grinder. I want to put a hole into the top so that I can attach a wire or string so I don't lose them. I used a punch to put a dimple into the wrench. I am trying to drill a pretty…
Fresh Codemonger
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13
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4 answers

What type of drill bit has square teeth on the shank?

I was cleaning out my collection of masonry bits and found the two shown in the accompanying picture. They are from a remodeling project from 20 years ago, but I do not recall where they came from (or why I bought them). I thought at first they…
Bob Sjoberg
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12
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4 answers

How can I drill my own electrical knockout in an appliance housing?

I would like to drill a regular (I think 3/8") knockout on a metal appliance housing. It is not tabbed like on a metal handy box. Which drill bit should I use?
amphibient
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11
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8 answers

What type of bit do I use to drill holes in stainless steel? Nothing seems to work

I recently bought some Damascus 1 inch ring stock (304 and 316 stainless). I sliced off about 8 mm of it using a bandsaw. I then stuck it in a vice and attempted to drill through it. I have tried silver/cobalt drill bits, masonry bits (didn't even…
Rilcon42
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5
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3 answers

What is the purpose of these drill bits with two tips?

A friend of mine likes to buy old tools and smilar at car boots, and he picked up a set of bits which neither he nor his friends could identify. He showed me two of them: They have two tips, one mounted radially outboard of the centre tip but…
bertieb
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4
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3 answers

Drive screws with cordless drill — Prevent hex bit from falling out of chuck

I'm planning to screw plywood to a partially-built cabin floor using Robertson screws (square head). I want to use a cordless drill instead of an impact driver to reduce noise. It's deer hunting season so I don't want to scare wildlife away from…
User1974
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4
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How do I drill a 60cm hole in a tree stump, 4.4 cm wide?

I want to put my washing line in the tree stump. Don't want to dig up lawn and concrete in pole, and no base which you put into the earth has been capable of holding up the rotary washing line (obv knocked about by the wind, using clothes as…
Ne Mo
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4
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4 answers

What do the 1/4 , 3/8, and 1/2 in the impact drivers mean?

I bought my first impact driver--a Worx 1/4 & 3/8 impact driver. I am trying to buy sockets and realised that these sockets come with drive sizes mostly 1/2". I read more and I found that the head of this bit is the size, but the bottom size seems…
asmgx
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3
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What drill bit should I use to drill a 2-1/2" hole through 8" of concrete?

I'm having some electrical upgraded and I need to drill a 2-1/2" hole through my 8" foundation. The foundation is poured concrete and has small rounded stones inside. This house is almost 100 years old so I'm expecting the concrete and stone to be…
CodeVar
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3
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1 answer

Why is this wood on my drill bit from wall framing a different color?

I was installing some new blinds and when I drilled into the framing above the window my drill bit had a darker color wood dust on it. Other places I have drilled at the dust is the standard wood color but this was darker and sticky. Any idea why?
DR9412
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1 answer

pilot bit for masonry hole saw

This seems like a stupid question, but I cannot figure it out ... I have a couple of masonry hole saws (carbide tips) that I am using to drill holes through a cinderblock foundation wall for various purposes. I have a mandrel for the hole saws. It…
RustyShackleford
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Why can’t my hammer drill drill a hole in concrete?

I do have a hammer drill (Bauer 7.5amp, Harbor Freight) and some 1/2“ Bosch masonry hammer drill bits. I‘m trying to drill a hole into my concrete patio. I have made it one inch deep but that destroyed two drill bits. One drill bit tip cracked off…
mitchkman
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3
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Tricks for fitting a 7/16" bit into a 3/8" drill?

I have a 3/8 hand-held drill and that's pretty much all I need for my projects. But now I have a project where I have to insert large dowels, and they will need a 7/16" hole. I don't have that size bit, but before I rush out and buy one only to find…
user766353
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