Milescraft5342 6pc. Drill Stop Set - Includes 3/16, 1/4, 5/16, 3/8, 7/16, and 1/2-Inch

I used this to assemble a multi section Toyota transfer case per Marlin Crawlers recommendation. This stuff worked really great, and I'm not sure how I've survived so long without it. It held the paper gaskets perfectly in place during assembly so I didn't misalign a single bolt hole. Especially useful for the rear transmission seal since I didn't drop the transmission to do the job. This is so cheap compared to the whole job, it is just a must have for any gasket work.I wish I had this when I did the water pump, but I will use it next time! So far my Transfer case has no leaks. I was concerned about excess build up inside the case that could clog oil orifices, but I think this stuff will either stick where it's put or disperse harmlessly in the oil. Really excellent product.

You need to tighten these against the flat spots of the drill bit, not into the groove of the drill bit. That makes it a little tricky when trying to get them to tighten at a specific height but overall, these work great and did exactly what I needed them to do!

As you've noticed, these stop collars are a few bucks more than some of the other options, but after using them, I can see why. The collars fit precisely and lock up tightly, but the best part is the collars are beefier and taller than others so they are truer to the spinning drill bit and stay locked in place. Great product!!

It is a good quality product. For dowel use

Simple, easy to use, and they work. For years I've used the eyeball or piece of tape method to try to drill holes to a certain depth. Bought these and I wish I'd gotten them when I first got a drill. As others mentioned, make sure the set screw is on the lands, not in the flutes. Only issue is that they don't come with any sort of case. I used a ziplock bag. Not the end of the world.

These are aluminum with steel screws. All seem to work as advertised. I would not expect them to stay put under a lot of force but just serve to indicate when to stop drilling. I just wish that the set included a 1/8 inch size. For the money, this is a good set.

In order to utilize, I had to take a round file to deburr the inner side of the set screw hole. When manufactured there was enough metal to prevent from fitting properly on the bit.With that rectified, it works as expected.At $15 I wouldn't expect the need to do what I did.

No seems to make drill stops that work all that well if they have to be locked down on the flutes, but these are far better than most. When on the shank of the drill bit they work very well and can be locked down tightly so they don't slip. These are well made. My old set that I finally tossed out in disgust had threads that stripped out if you tightened down hard enough to lock the ring to the bit. These are more robust. Good stuff!