The vertical attachment is three tools in one- when used with the magswitch pro featherboard, the vertical attachment creates an adjustable, stackable featherboard unlike any other on the market. With the vertical attachment installed, hold wood securely against the fence and table for a safer, cleaner cut. Install one level of risers, or two, to handle a taller work piece. Even allows you to add another set of risers and second vertical attachment to hold your tallest pieces with greater stability. Dual action hold when attached to pro model. Adjust vertically and horizontally for strong, precise control.