30mm Guide bush guides the router when using a jig or template. Can be used with Trend UNIBASE. 6mm spigot projection. 60mm wide plate. Guide bush guides the router when using a template. 30mm diameter guide bush for general purpose use on templating work and with Trend jigs. 60mm wide plate is compatible with Trend routers excluding the T7. Can be used with Trend UNIBASE for other incompatible routers. 6mm spigot projection ideal for use with user made templates. Trend Guide Brush 30mm. Trend Guide Bushes can be attached to the base of the Router. They are designed to follow the contours of a template. Outside diameter: 30mm Inside diameter: 27mm Projection from plate: 6mm.