Guide bush guides the router when using a template. |Fits directly to Trend T3,T4,T5,T5 MK2, T9,T10 and T11, and some other light duty routers. |Will fit other makes when used with GB/5, GB/PLATE or UNIBASE Sub-base.|This guide bush has a 4mm spigot ideal for use with the Trend CDJ300 dovetail jig.