Weiler Tiger Zirc Type 27 /Grind Combo Wheels Self-sharpening zirconia alumina grains deliver a fast rate for the full life of the wheel. Patent pending Optimum Use Line helps maximize wheel life, improving productivity and sustainability. Combination wheels offer flexibility and efficiency when switching between cutting and grinding applications with a right angle grinder. Available with 5/8 in-11 hub arbor for quick change or 7/8 in arbor. Best for use on carbon steel, structural steel and metal Pack of 25