Delta No. 35-561 R. 5/8” bore. Set is sharp and ready to go. Cuts dadoes anywhere from 1/4” – 13/16”+ wide. Set includes two outside blades (8” x 24T), one stackable 1/16” chipper, two stackable 1/8” chippers, one 1/4” chipper, and a CMT Dado Shim set for making micro adjustments to the dado width (2 @ .004”, 2 @ .0075”, 2 @ .010”, and 2 @ .020”). Blades and chippers have plenty of life left in them for sharpening.