You have found the site to purchase one of the most innovative, easy to use CNC dust shoes available. The "Split Shoe" is a two piece shoe. An upper acrylic piece clamps around the bottom portion of the router/spindle. A brush ring is attached to the upper acrylic piece by rare earth magnets. This removable brush ring configuration provides quick and easy access for bit changes and the clear acrylic allows the bit to be viewed during cutting. The standard shoe has 3" long brush that is long enough to clear clamps and a 1" inner brush that helps keep the brush from getting sucked into the inlet thereby providing excellent collection efficiency.