Review on Pit Bull CHIS801 Mandrels 16 Piece - The Ultimate Tool Set for Precision Drilling Tasks by Jay Swearengin

Not bad for the price. As everyone has said, it's oily and in a cheap crappy case - expect that. The Beats themselves are of decent quality. I went through 100 1/2" wide holes with a 1.75" saw before the mounting slot warped and the drill became unusable. I ran it constantly and really hard so it probably didn't help. The Bracket is a double edged sword obviously this would prevent the drill from warping like me but then you wouldn't be able to use the holes it occupies to knock out the circles of wood which get stuck after each cut unless you use a brace , you can insert the supplied Allen key and hit it with a hammer to loosen stuck wheels.The only alternative solution I see is to disassemble the drill bit every time you drill a hole.For folks who care complaining about the bit sticking and jerking, there is no practical solution other than careful use You can't have something driving that much torque into a loose piece of wood bites and expect everything to stay in place. This can usually be avoided by putting your foot on top of where you are drilling or pinching it. Be careful when drilling the same hole from both sides as misalignment can cause severe jerking.