Tiger Zirc 4.5 inch type 27 combo wheels cut faster and last longer so you get proven productivity at an exceptional total cost. The self-sharpening zirconia alumina grains retain a high cut rate throughout the life of the wheel while a hard bond delivers long wheel life for heavy duty applications. Combination wheels offer flexibility and efficiency when switching between cutting and grinding with an angle grinder. A smaller hub on 4.5 inch wheels keeps the wheel from gouging valuable parts as well as allowing for 30% more usable wheel area. These wheels are designed for hardcore Metal Fabrication professionals who need a high performance solution when cutting and grinding steel, structural steel, and iron.