I had an extremely powerful two-speed AEG with AVS for many years, it lasted until the switch packed up after 15 years of constant use. Additionally, if you want to use the drill for applications other than just diamond core drilling, you will need one with a keyed chuck. Plunge feature allows the user to make quick plunge cuts for electrical outlets together with an integrated 45 / 22. Has a new motor which gives improved performance in applications with dry core bits up to 127mmn in bricks or soft masonry.

I was very happy with the performance of this drill, cut 127mm cores in to both brick and block work with no problems. The DeWalt D21570K-GB Silver Bullet diamond core drill combines high performance with user friendly design. One downside is it vibrates quite badly with a long extension on the bit, but the clutch works well and compared to the Makita one I have been using it is a much better machine. It's amazing how one bit of decent kit can save so much time and make a job which was a right trauma into a piece of cake. In my experience, never use any of these type of drills in the high speed selection mode when drilling into thick masonry with a diamond cutter or masonry drill bit, even an SDS bit.

I am a dewalt man and after having my last dry core diamond drill stolen which wasn't a dewalt i brought this one.

To choose between diamond core drills: The key consideration when selecting between diamond core drills is the maximum drilling diameter required. The DEWALT D21570K Dry Diamond Drill has a new motor which gives improved performance in applications with dry core bits up to 127mmn in bricks or soft masonry. The anti-vibration handle with a rubber-coated grip, means that you stay comfortable while operating the tool and a 16mm steel chuck provides excellent bit retention and allows for quick bit changes. The DeWalt D21570K dry diamond drill has a new motor which gives improved performance in applications with dry core bits up to 127mmn in bricks or soft masonry. Featuring a 2-speed gearbox for increased versatility when drilling in wood, metal and concrete with standard drill bits, performance in applications with dry core bits benefits from the powerful motor.DeWalt D21570 two speed dry diamond drill is a reliable powerful core drill made to cut holes up to 127mm. The 2-speed variable gearbox allows for added flexibility when working on wood, metal and concrete with standard drill bits. for thick masonry, and pretty much for any type of diamond cutting work, as the diamonds a lso last longer when not overheated. An anti-vibration handle with rubber-coated grip means that you can operate the drill steadily and in comfort, and the heavy duty steel chuck allows for excellent bit retention and easy bit changes.

Designed to perform quick and accurate core drilling into brick and masonry up to 152mm, along with a two-speed gearbox with mechanical clutch for added user protection. The electronics provide e-clutch, power-up and overload protection and the two speed gearbox for increased versatility when drilling in wood, metal and concrete with standard drill bits.With a multi-position side handle a wide range of dry diamond drill applications can be tackled with ease.