Description: Material: Made of high quality aluminum alloy, plastic, Lightweight , durable and sturdy . Feature: Router circle cutter jig moving range of the backer from the center is 37-172mm, Suitable for 65mm diameter trimmer . Two positioning methods: 8mm locating pin, drill hole, can be backfilled with log tenon; 2.5mm nail hole, straight nail method, can be backfilled with repair paste Easy to Read: Both the small and large circle jigs have built in metric and scales, with an easy readout window for setting the diameter of both your inside and outside cuts Trimmer Router Machine Base: suitable for FF04-6, for FF02-6 install, Transparent base design, the working conditions such as trimming and milling are clearly visible, and easy to use . Fit Size: Perfect replacement for old or damaged base, for fast tool free Bushing and router attachment exchanges . Specification: Material: Aluminum Alloy Color: Black, Clear Size: 242x90x135mm/9.53x3.54x5.31 inch Package Includes: 1 Piece Wood Trimmer Router Tool Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you!