Model Number: Vitrified N-3 Key Specifications/Special Features: Professional grinding wheels for bevel gear grinding:Features:With combination abrasive materials of 5SG, high class ceramic abrasives, and Treibacher white fused alumina, utilizing teh most advanced bonding technology V80, our bevel gear grinding wheel achieves top class of the quality in the world. SizeGradeSpeed 220x95x170mm 3SG80J8V80 35m/s 260x110x200mm 5SG80J8V80 35m/s 312x98x251mm 5SG80J8V80 35m/s 330x98x193mm 5SG80J8V80 35m/s 335x110x270mm 5SG80J8V80 35m/s 386x98x312mm 5SG80J8V80 35m/s