Just deburred - with Makita cordless drill (and this Laser 7510) - 36 1/4" silicone bronze hex head screws. 1/4" is 6.4mm, so there is a feeling of carving - the tool has done its job. Got it because most of those ridges on the internet aren't that small. I got it too because it's from the UK. A fair price indicates that the product is made somewhere in the east. Wherever others are made, including the completely fake ones I was scammed with. So I bought the laser because of its hex shank, size, design, HSS blades and price. It arrived in a handy blister pack that can be reused to store the tool after use. [The teeth are quite small. Thoughtful packaging to keep the tool safe in the tool bag along with the drill is why it really deserves an extra star.] There were wobble issues when using the tool. Partly he sat perfectly on the bolt. The chamfering should be done at a slow speed, but a quick nudge after centering worked better for me. The rather odd blades are said to be made of high-speed steel. Paying a little more for a more durable cobalt or carbide tool would be great. But I'm glad I found it and give it 5 stars for "good show".