Spiral bits provide a shear cutting edge that leaves a smoother cut than standard router bits. Up cut spiral design provides the best control with hand or table routing. When creating dado's this design brings chips up and out of the cut.
We had a little hiccup with a previous order but they reviewed my photos and information and made it right.
I will not hesitate to keep ordering from them in the future
This is if memory serves my 4th shipment from KJP & the 2nd containing Bolivian Rosewood. The product is well packaged, the choice of boards & the milling are top notch. Shop here with confidence.