Feacture: Compatible with 4030-PRO and most 3018 series CNC machines on the market, including 3018-PRO, 3018-max This dust cover is made of High-quality materials. The design helps you keep an eye on your operations. Equipped with a 23mm long nylon brush to maximize vacuum suction and help act as a dust sweep with high dust removal efficiency. Keep your machine and work area clean while cutting, drilling, and carving. Two-Piece Magnetic Design: Durable, light and flexible, convenient for daily use and maintenance. Easy to assemble and install. Only take 3 steps to finish the installation. The split design makes it much easier to replace bits. You only need to pop-off the bottom cover when replacing your bits, no tools required , and avoid other complicated procedures. Spindle Diameter: 45mm / 52mm Material: plastic colour: Black+ parent Package Contents: 1 x dust cover 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.