Extend your 3018 CNC Y- from 290 mm to 450 mm, get a 320*450mm basic area, 320x370mm workable area. Upgrade your 3018 CNC X- with a longer T8 lead screw and knob, makes the operation more convenient. Compatible with most 3018 CNCs, 3018 Pro, 3018 Pro Max, etc. to upgrade your 3018 CNC and get a bigger one. Easy to Assembly. NOTE: YOUR 3018 CNC SHOULD BE EQUIPPED WITH ∅8 mm T8 Lead Screw ∅10 mm Guide Rail No Counterbore on Plates for Rails Colour: as shown Material: metal Package Contents: 2 * 2040 base aluminum profile (length 450mm) 2 * 10mm optical (length 450mm) 1 * T8 screw (length 470mm) 1 * Handwheel 1 * copper nut 1 * Elastic Coupling 1 * Spring 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.