Sinoprotools Biscuit Cutter Joint Slot Router Bit,1/4-Inch Shank High Hardness & Wear Resistance # 10 Slot Cutting Router Bit,Joint Slot Wood Milling Cutter, Woodworking Tool for Platform and DIY

The biscuits I have were a tight fit in the slot that this router bit cut. Nothing unreasonable, just required a tap with the rubber mallet. I prefer a snug fit in order to line up the materials over a loose sloppy fit that can shift. Definitely recommend.

good

These bits are manufactured well with one exception. The cutting edges are straight by my measurements, the shafts are nicely machined, and I see no undesirable artifacts of manufacturing (obvious burrs, edge irregularities, etc.). I placed the largest (1/2") bit in my laminate router and visually inspected it as it spun. It spun true by this crude measure, certainly true enough to be able to do the job for which it's intended.The one issue I've found is the bearing on the 5/16" bit grinds (more tactile than audible) as I turn it. Something's not quite right in its machining. After spinning it for awhile to see if there was something small that would go away I found the problem did not subside. I placed a very small drop of 3-1 oil on it and that did not fix the problem either. I figure that as I use the bit either the high speed spinning will wear down whatever is causing the grinding or the bearing will seize. The former seems more likely.These bits conform to the measurements advertised except the largest one (1/2" diameter) has a cutting edge that is about 1-3/16" long, rather than the 1" stated in the top featured image (below they do say it's 1-3/16") -- not a big deal since you're getting more.Without the bearing issue these would be a five star set.

Well... I have to do the work. But these make doing the work easier.The cutting edges appear straight, and are very sharp. The bearings feel like they spin smoothly without any noticeable friction.I am not a "woodworking professional" so I may not be a good judge of durability or quality. But for my needs, these are great and did exactly what I needed them for.

The edge on all of these that arrived in the set are sharp and look well machined. Testing the spin by hand first none of the bearings seem to have any issue they all spin smooth and clean. So far I've only needed to run two of them but both of the two had no problems with her spin at high revolutions and cut fast and clean. So far I haven't noticed any dulling or issues with the routing but I'm not a professional using this all throughout my week at most so far I've only had around me 10 uses in the past few months but those have all been good.