Offering four adjustable depth settings for flexibility and versatility, the Porter-Cable® 8931 plunge router base is so easy to operate you can plunge with just one or two fingers. Solid multiple stops combine with a convenient lever that can be locked into the \"open\" positions for smooth plunging. Brass bushings add durability, a thumb rotating stop turret ensures safety and a dust collector port helps keep your workspace clean. Porter-Cable® Plunge Base, For Use With: 891 and 892 Router, Brass Bushing/Steel, Clear