PFERD Ezmount crimped wheel brush with carbon steel wire is designed with a flat side profile that matches all mounting flanges on pedestal and bench grinders for a correct fit. Easy installation takes seconds. The telescoping bushing is self-sizing and makes full width contact to prevent the brush from falling into spindle threads. Crimped wire wheel eliminates mounting problems commonly found with other bench brushes. Specification: Diameter (Inches): 8; Arbor Hole (Inches): 2, 1, 3/4, 5/8; Wire Size: .014; Trim Length (Inches): 1-3/16; Face Width (Inches): 7/8; Maximum rotational speed: 4500 RPM.