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PFERD Polifan Special line SG-PLUS flap disc with a high quality ceramic oxide coated material for long service life, and top sized with a cooling agent, which guarantees cool grinding on poor heat conducting materials, without thermal damage to the work piece. With 60 grit material for finer surface finishes, these discs are designed for all demanding grinding applications. Specification: Diameter (inches): 4-1/2; 5/8-11 Thread; Grit: 60; Maximum Rotational Speed (RPM): 13300; For Fillet Weld Width: Large greater-than 5/16" (8mm); Thickness (inches): 5/8; Thickness (mm): 16; Radius Size: Large.