This Evolution Multi-Material Diamond Demolition Disc Cutter Blade is compatible with our older 305mm/12in Disc Cutters and our current R300DCT and R300DCT+ models. Specification: Diameter: 300mm Bore: 22.2mm Thickness: 2.1mm Segment / Tooth Thickness: 3.4mm Segment / Tooth Height: 3mm Segment / Tooth Quantity: 20 Sub-Segment / Tooth Quantity: 100 Max. Speed: 6,400/rpm