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4.5
These are basically the "professional version" of the FTG countersink set, which is extremely expensive. This Century Drill and Tool 37405 set is the same as the more expensive FTG pro set. These Century are pinned on the shanks, which I was not expecting at all, meaning the drill bit cannot slip or rotate or fall out of the hex base. Most drill bits are glued or pressed into the hex base, on other sets. This set cannot fail from heat, because there is no glue.Immedietely I did the worst thing possible and used these in a very powerful Milwaukee 18 volt impact gun, and "hammered" these into some old fir, and nothing broke, thank god. But I realized that it was not ideal, because the hard hammering caused the cutting blades to stop turning, and the drill bit in the center kept spinning, because the allen wrench set screws were not sufficiently tight.The allen wrench that comes with these isn't the right size. Just throw it away.When I used this with my M18 Milwaukee drill, there was zero slippage, and the blades are extremely sharp. It cuts easily into the wood with very little downward force. I also used it on some fir plywood and it cut easily into it. The cutting head is the sharpest I've ever used on countersink bits. They are literally 10 times more sharp than the normal cheap single blade countersink bits, which basically burnish their way into the wood. These Century bits cut the wood without any force, leaving a very clean, non-frayed, perfectly round countersink hole in fir plywoood and fir boards. I haven't tested it on hard wood or pine yet.The drill bit with the fine point is amazing. It's the first time I've used this style of countersink bit, because normally I used uniform standard bits in countersink tools. The bits cut extremely well with very little force, they actually drill into the wood (unlike the very cheap ones that apparently don't cut at all) these are highly functional wood drill bits.Cons: No case.You'll need to clean the wood shavings out of the drill bit, using a small brush or metal pick, the wood particles seem to really stick to the drill bit.Very sharp. Cuts very fast. Takes some getting used to, since I've never used a countersink bit that actually works properly, despite 23 years of woodworking.No adjustment collar for the countersink flared hole depth. (You can purchase countersink adjustment collars for $3.00, just do a search on eBay or Amazon for countersink collars. Or you can use some white electrical tape, etc, to give you a depth reference. Or you can use a drill press with a fixed depth.)Allen wrench doesn't fit the screws at all. You'll need a new allen wrench, the one supplied was too loose, and I didn't try to use it.
