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Home Depot [homedepot.com] has RYOBI Rotary Tool 1/2″ Sanding Band Mandrel on sale for $2.60. Shipping is free.

Note: Sanding bands sold separately.

Features:Mandrel diameter: 1/2″
Compatible with 1/2″ sanding bands
For use with rotary tools
Allows attachment of sanding drums to rotary tool
Steel construction