Feature: 1. Extra Large CNC: This kit will extend the Y axes of your CNC to move 470 mm and travel 320 mm, easily converting your 3018 CNC to a 3040CNC. 2. Compatibility: This engraver extension kit is a direct upgrade to most of the 3018 series CNCs on the market, featuring an 8mm screw and 10mm guide rail. 3. Simple Installation: This engraver extension kit is very easy to assemble and requires only one hexagonal screw to complete the upgrade. 4. Cost Saving: No need to spend money on another model of engraving machine, you can adjust the engraving machine for the size of the object to be engraved. 5. Excellent Quality: This engraving machine extension kit is made of aluminum alloy and brass, which is resistant to wear and tear, not easy to break, and has a long service life. Specification: Item Type: 3018 Pro Engraver Extension Kit Material: Aluminum Alloy, Brass Base: Approx. 450mm/17.7in T8 screw: Approx.470mm/18.5in 10mm Optical Axes: Approx.450mm/17.7in. Package List: 2 x Base2 x 10mm Optical Axes1 x T8 Screw2 x Limiters2 x Screw Holder1 x Knob16 x Mounting Screw1 x Bushing