This set has been a dream of mine for a long time, I used to have a good one just recently Reason for purchase is everything you could want from a folding nozzle set. The real luxury of this particular set is the sixteen bearing rings (ranging from 1/16 to 1 inch) giving you the ability to fit the right ring. to get a sheet of any depth. This is a useful improvement over the old method of swapping out the bearing yourself, where you were limited by the availability of different OD bearings (it would take a lot of research to get the size and/or supplier). In this system, a pair of standard 1/2" bearings sit in a sturdy anodized aluminum ring (I think) with varying depths - you just need to remove the top (or bottom, depending on router orientation). ), f Slide on the "donut" and replace it with another one of a different size, insert it into the upper bearing and screw everything together with the hexagon screw. The beauty of this is the speed - you can easily change the ring while the cutter is in the cutter collet. A rather minor complaint would be that in some cases both bearings pop out with the ring - this happens more often if the ring has been used between replacements - annoying but still easy to swap out the lower bearing and washer; I'm not sure how to prevent this from a design standpoint - you want the fit to be tight enough to avoid lateral tilt (wiggle) when turning the bit. Sometimes the bearing gets stuck in the ring and it can be difficult to remove - I find it best to use a sharpened pencil as it's soft enough to wedge into the drill and doesn't risk damaging the inside of the damaging the yoke or the supplied bearing. little more than I expected. It is 2" in diameter, 1" cutter depth plus collar/screw depth (3/4"?): This is a large drill bit. I've only used this set with a 2 1/4 HP Bosch and while it works great I run it slowly to be safe and I sneak up on deep sheet piles in two or three passes. The bit will probably fit my 1 1/2 HP P/C router, but I have a feeling it probably needs all the torque it can get. A very good sentence. With careful handling of the hard metal (aluminum bushes don't get too dirty when dropped) this set will last a long time. Oh, and this is one of those weird cases where the plastic case is actually an improvement - it's solidly built (real hinges, custom foam insert) and mine looks brand new.