Made of aluminum alloy, easy to use and not easy to rust. A convenient center hole bushing is used to align the router so that it is centered in the drill bit hole. Makes it easy to precisely drill and install any router. It's easy to use and does the job well. The multifunctional router table insert board may be a good assistant for your woodworking. Type: woodworking engraving machine flip board Scale: Laser-engraving Surface treatment: anodized Board size: 240 x 245mm Screw pitch: 62 x 70/45 x 56mm Material: aluminium alloy colour: silvery Package Contents: 1 1 x Push Ruler 1 x Backer 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.