Dynabrade 50125 3" Dia. Disc Backup Pad, 1/4"-20 Thread, Hook 'N Loop 
Dynabrade 51149 – 4-1/2″ (114 mm) Dia. Disc Sander Backing Pad
$30.86
Medium Density, 3/8″-24 Female Thread
4-1/2″ (114 mm) Dia. Disc Sander Backing Pad
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