Tough zirconium grainHigh performance cutting and light grinding for the toughest applicationsIdeal for root pass grindingType 27, Designed for both cutting and light grinding, eliminating the need for two separate wheelsAll sizes reinforced with the highest quality fiberglass for maximum safety and performanceOur unique Super-Lock?âòÀÞ?â Hub combines both a mechanical locking system and chemical bond providing one of the safest, vibration-free designs in the industryReusable 5/8-11 adaptor for use on Type 1 and Type 27 reinforced wheels with a 7/8 arbor, a max. diameter of 5" and a wheel thickness of .045 to 1/8" available in accessories. Part #95055Also available: Pipeline Wire Brushes