Freud DCP050CONH01G Random Orbit Sander Conversion Pad 5-inch sanding disc Universal hole pattern, one size fits all hook and lock backing Universal hole pattern - a one-size-fits-all design (fits all 5 and 8 hole PSA Orbital and DA sanders) for fast and precise alignment Premium hook and lock backing enables repeated attachment and removal of discs for a consistent secure connection Universal Conversion Disc Backing - an industrial-grade Pressure Sensitive Adhesive (PSA) backing for a secure bond