Pack of 5 Screw Replace OEM Pad for Ryobi CFS1503K CFS1503 CFS1502 CFS1503G/ P401/P400/ ZRCFS1503GK Compatible with Ryobi OEM Part# 039065005001/019001001017 / 019648001027 / OEM HM-019648001028 HM-CFS1501-01 Platen is the part of the sander that you attach the hook and loop sandpaper to. To prolong the life of the platen try not to put to much pressure on the sander when sanding. Excessive pressure creates heat build up in the sanding pad which will quickly damage or even melt the tiny plastic hooks on the pad Aftermarket