Type A/B A set of woodworking bench tools includes 1 router table insert plate, 4 pieces router insert rings and some fixing screws. Features: Made by aluminium alloy, it is practical in use and not easy to rust. Convenient center-hole bushing used to align 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: Material: Aluminium alloy plate, plastics rings Type: with 4 red insert rings, with 4 black insert rings (optional) Size: Approx. 235 * 110 * 8mm / 9.3 * 4.7 * 0.3in Hole distance: about 62 * 70mm / 2.44 * 2.76in Weight: 450g / 0.99lb Package size: 250 * 130 * 40mm / 9.8 * 5.1 * 1.6in Package weight: 520g / 1.15lb Package List: 1 * Router Table Insert Plate 4 * Router Insert Rings 1 * Pack of Fixing Screws