Product Overview Part Number * SPIR-F500-RStandard Pack - 1 EASC F500-R BACKING PADS Features: Standard air-cooled all-purpose | Ideal for sanding operations on metal, plastic, fiberglass, etc.Dia. : 5 in Face Type : Spiral Hardness Grade : Flexible Speed [Max] : 10,000 rpm Thread - TPI or Pitch : 5/8 in - 11 Wt. : 0.45 lb