This handy plastic brush is great for clearing off a workpiece and moving wood chips, metal and other accumulating debris through the vacuum port and into the hose of a dust collector. The top end of the brush has a slide that exposes 3/4″ long and 1/2″ diameter bristles. The bottom end has a twist action to expose and retract 1-5/8″ long x 1″ diameter bristles. 5-1/2″ long when closed.