With 5 R8 collects 0.15''=4mm, 0.2''=6mm,0.3''=8mm, 0.4''=10mm, 0.5''=12mm. Accessories for end mill, lathe, drill Bit is included. With 2 kind of grinding wheels. one is made of white corundum and one is of metal. Two fine-tuning shanks guarantee the accuracy and the sharpening quality. Packaged in wooden case made it broken-resistant against tough shipping.