Super Size your : This kit will extend your 's Y-Axis to have 370mm of movement (14.6inch), 320mm of travel, easily convert your 3018 to a 3040. Compatibility: It's a direct upgrade to 3018 Series in the market. The 3040 Aluminum Spoilboard and 3040 MDF Spoilboard for this extension kit Simple Assembly: We will take you through the assembly process step of the way. Cost-Effective: Save money by putting your current to better . You 't need to spend tons of money on a bigger one. Colour:Silver+black Material:Aluminum alloy Package Contents: 2 x Y-axis Aluminum Extrusion (520mm) 2 x Y-axis Linear Rail (520mm) 1 x T8 Lead Screw (525mm) Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.