Magswitch Risers for Vertical Attachment, Black Magswitch Attachment Risers turn the original Magswitch Vertical Attachment into a Stackable Featherboad , Dual action hold when attached to Pro model , Adjust vertically and horizontally For use with the Magswitch Vertical Featherboard Attachment (sold separately) Allows for taller stacks when using the Featherboard Attachment horizontally. Buy additional Vertical Featherboard Attachments to build taller stacks.