The Trend UNIBASE/TRIM Universal Trim Router Sub-Base unlocks the potential of your router by providing improved concentricity and compatibility with Trend Guide Bushes.With 9 Hole Patterns to suit most 1/4in trim routers, including 18V cordless models.Made from reinforced nylon for a low-friction, precise routing surface.The Precision Centring System ensures perfect concentricity between cutter and guide bush for pinpoint accuracy with routing jigs. Reinforced threaded brass inserts provide secure mounting points for guide bushes. The Quick Pattern Finder makes locating the hole pattern for your router quick and easy. Includes M4 screws for router attachment.