Circular cutting jig is perfect for making speaker cutouts, can be directly mounted on the base of various types of cut-in routers, can be reused and has a long service life. Circular cutting trimmer can cut 256 circles with diameters ranging from 2-1/4 to 18-3/16 inches, and can cut circles of different diameters, suitable for most trimmers. EASY TO USE: Plug-in router tool with easy-to-read graduations is calibrated for 1/4 inch milling heads for your convenience, allowing you to mill quickly and work. Router Circle Cutting Guide uses precisely drilled pivot holes to hold the pins in the holes, ideal for plug-in routers and easy to install and use. Milling machine accessories are one of the must-have tools for woodworking, which can effectively help you improve your work efficiency and save your energy. Specification: Item Type: Circle Cutting Jig Weight: . 284g / 10oz Size: . 33 x 17 x 0.5cm / 13.0x6.7x0.2in Material: plastic colour: yellow Package Contents: 1 x Circle Cutting Jig Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.