ZIP WHEEL 4-1/2"X1MMX7/8 Z60T|TIGER ZIRC ULTRACUT TYPE 1|Tiger Ultracut thin cutting wheels provide a fast cut & long life on metal. They are made with a self-sharping zirconia alumina grain that retains a high cut rate throughout the life of the wheel so you get exceptional performance on thin gauge and small diameter steel and stainless steel applications. Type 1.