Description Diablo's 5" Random Orbital Sander Universal Conversion Disc with Hook and Lock backing converts 5-hole and 8-hole Pressure Sensitive Adhesive (PSA) Orbital and DA sanders to Hook and Lock. Diablo's conversion disc includes break-through innovations that improve performance, extend sanding life and increase productivity.Universal hole pattern - a one-size-fits-all design (fits all 5" and 8" hole PSA Orbital and DA sanders) for fast and precise alignmentPremium hook and lock backing enables repeated attachment and removal of discs for a consistent secure connectionUniversal Conversion Disc Backing - an industrial-grade Pressure Sensitive Adhesive (PSA) backing for a strong and secure bond between your sander and the conversion discFor use with PSA orbital and DA sanders in wood, metal, and plasticsQuantity - (1) 5" Random Orbital Sander Universal Conversion Disc