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I agree with Damon, that has to do with chatter, the drill is actually moving up and down to allow such a thing to happen. The first is much less likely but I thought I'd point it out, I've seen a least one bit that you ran the drill 'backwards' for the countersink to cut correctly. Don't rely on the bit to self center - make sure you are drilling in the exact center of the hole before the bit engages the wood. Use a countersink with a pilot bit, which will make sure the countersink doesn't wobble once it engages the workpiece.They are part of the SpeedLoad? Plus system for the fastest and most convenient way to change bits. One is also the fastest way to deburr a hole in sheet metal or pipework. I have both and when I grab the tapered set, I’m always annoyed.When it’s snapped onto the driving body in the countersink mode, you can drill both pilot hole and countersink. Snap the countersink off, flip it around and snap it back in to expose the appropriate driver bit to set the screw. A set of simple round shank countersink drill bits for your construction needs.The Jack Rabbit countersink is a “quick-change” combination, using separate drive shanks sporting both Phillips and square-drive ends. In use, you drill the pilot hole and countersink, then just snap the driving body off the shank and drive the screws home in a quick one-two action. All three sets include a storage case, as well as Allen wrenches. It can often be difficult to avoid chatter when cutting with countersink cutters. As usual in machining, the shorter and more rigid the setup, the better. Better-quality fluted countersink cutters sometimes have the flutes at an irregular pitching.<ul> <li>Then you drive your screw and insert a plug to cover it.</li> <li>So when it’s time for your next DIY wood project, don’t be lazy and countersink your screw holes.</li> <li>And short of brass reproduction screws and a few plated ones I don’t know of any tapered wood screws you find these days.</li> <li>Countersinks are small extended parts that must be attached to common drills.</li></ul>The most common angle sizes are 82 and 90 degrees, but 60, 100, 110 and 120-degree angled points are also available. Allows you to quickly & easily change drill bits & accessories with no hassle or chuck key. The standard hex shank on the countersink fits all power bit quick change chucks. The combination drill, countersink & counter bore for wood plugs are made of alloy steel & thru hardened for long life plus the ability to resharpened. The standard drill bit can be replaced or adjusted for the length of the screw. Two flute construction for fast & clean chip removal.<h2>Shop The Store</h2>I believe the reason for a non round countersink is the number of flutes/blades on the bit. With an odd number, if you can imagine it, a blade on one side is cutting whilst there is no cutting blade on the opposite side and therefore no even support for the bit. This will cause the bit to wander according to the amount of support it is receiving. I experimented with a new, sharp 5 fluted bit in a piece of scrap pine pre drilled and it produced a hexagonal hole. I also used a new, sharp 6 fluted bit and it produced a perfectly smooth round hole. I used a hand held drill and the speed or pressure made no difference.<h2>Pilot Holes: Why To Use The Right Drill Bit And Countersink</h2>Countersinking a screw helps it lie flush with the surface of the wood to hide the hardware. Start by measuring the diameter of the screw’s shaft so you can install a drill bit that’s the same size. Clamp your wood down to secure it, then put a dot where you want to make your hole.Each all-in-one countersink is adjustable to match various screw lengths. To make an adjustment, loosen any setscrews holding the drill bit, slide the bit to increase or decrease the length, then tighten the screws to hold everything in position. And second, a tapered hole allows additional thread contact as the screw travels toward the bottom of the tapered pilot hole. As the hole narrows, the threads cut deeper into the wood. But you'll notice that usually, countersink bits for metals are black or deep gray in color.A hex shank not only solidifies the connection between the drill and the bit, but also helps keep it from wobbling. I like that the container is a sturdy wood case that not only looks presentable, but also houses all the pieces nicely for easy access. The sizes, part numbers, and other useful information are all written inside the case. These drill bits are heat-treated to make sure they are ready for any job, no matter how tough. I use one made by Amana that I buy from Apex Saw in Reno NV. They make a very clean hole for plugging and bits are easy to change if they break.<img width="301" src="https://cdn.shopify.com/s/files/1/2988/2742/products/product-image-514932888_1024x1024.jpg?v=1519116181"> https://boosty.to/jjohnbilliou For those who want simple round shanks, the CSLU 5Pcs 82 Degree Countersink Set may be just right for you. Each of them features an 82 degree angle, with sizes of 1/4, 3/8, 1/2, 5/8, and 3/4-inch. The five-flute design improves smoothness and also protects the sharpness of the tip.