Trend TREGB30 Guide Bush 30mm Dia E44184 The Trend guide bushes can be attached to the base of the Router. They are designed to follow the contours of a template. GB30 Features & Specification: Can be attached to the base of the Router Designed to follow the contours of a template Outside diameter: 30mm Inside diameter: 27mm Projection from plate: 6mm What is Included: 1x Trend Guide Bush 30mm Dia E44184