Made by aluminium alloy, it is practical in use and not easy to rust. Convenient center-hole bushing used to aligned the router so it is centered in the bit hole. Make accurately drilling and mounting any router easy. It is easy to use and make the work be well done. Specifications: Type: with 4 black insert rings Colour: silver Material: aluminum alloy Size: . 235 x 110 x 8mm / 9.3 x 4.7 x 0.3in Hole distance: about 62 x 70mm / 2.44 x 2.76in Package Contents: 1 * Router Table Insert Plate 4 * Router Insert Rings 1 * Fixing Screws Set Only the above package content, other products are not included. Note: Light 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.