Bosch 1x EXPERT Self Cut Speed Spade Drill Bit (for Softwood, Particleboard, Ø 25.00 mm, Professional Accessory Rotary Drill/Drivers)

Excellent cutter that cuts time after time. Bosch quality

As you'd expect with such a well-known make - it does what it is supposed to do and does it well

Great bits and a really handy case to keep them protected and ensure you don’t leave anything behind on sore.

These are generally good cutters. Better than standard cheap ones, but can get jammed if using a cordless.These cutters have a threaded point section, so pull themselves through the wood, but this does mean they can get jammed fairly easily if they can't cut the wood as quick as the thread pulls it through. This was with using a decent professional grade cordless, so imagine this would be more of a problem with a less powerful tool. Simply reversing the direction and running it back a bit, then building up a bit of speed seems to do the job (at least for a cm more!). Still quicker and easier than the cheap hole cutters.Can leave a slightly messy cut, so use a forstner bit is you need a cleaner hole.

I replaced an ancient hole cutter of a similar design, also for 22mm holes, with this one. I was intending to cut holes in the side of a door to take a mortice lock. Using the old hole cutter, it just spun around and didn't take very much off at all. This Bosch hole cutter is exactly the opposite. It drags itself in thanks to the spiral tip, and chews through the wood at an almost alarming rate. I was using a hand brace and all my force was going into turning it as it pulled itself into the wood, taking a fairly hefty cut for each rotation. I didn't need to push on the brace at all (absolutely no push force required at all to get it to cut). It made a neat and tidy series of connected holes. The holes were overlapping to create the mortice lock cavity, and having measured when I was going to start each hole, the drill never veered off even though there was about 7mm of overlap between the holes. The wood didn't split, even though I was into the door by about 80mm, and drilling by hand. Because of how effective this drill bit is at getting through wood with a 22mm diameter, it has to be 5 stars. I'm just wondering what would happen if I put this into a power drill where the slowest speed was still say 1000rpm. I think it would just fly through the wood in milliseconds and perhaps not be very controllable. I'd say that if you're planning to use this with a power drill, make sure it has a slow start / infinitely variable speed control and take it very slowly. It'll need to have quite a lot of torque to turn this due to the depth of cut. Provided you can provide enough strength in your arm to stop the drill wrenching out of your hand, hole cutting this way will be fast, almost effortless, very effective, and neat.

Bought it for some bench dogs, did the job.

I drilled 4mm pilot hole to locate the centre of the exit hole. I drilledinto the exit hole 10mm then went to the original hole and drilled through stopping the drill BEFORE withdrawing the drill bit. An almost perfect edged hole was the result. The quality of the drill bit is very good and made it easy to achieve a good result quickly.

Well built, good price, stays sharp, easyto use in impact and drill, solid shaft, looks slick. it comes with a nice zip pouch so you can throw in backpack or systainer and go on site. Plenty of sizes for electrical work and plumbing