1/2" medium density foam adds conformability to a 5" Clean Sanding Hookit backup pad for edgework * Hookit surface securely holds a Clean Sanding Hookit backup pad (sold separately) * Multi-hole Clean Sanding pattern helps capture and remove more dust than 5- or 6-hole systems and prolongs disc life * Hole pattern does not require alignment of holes, for faster disc changes * Max OPM and RPM 12,000