Usage Tips:Upgrade T8 Anti Backlash Nut: Made of brass material,not easily oxidized and corrosion resistant. Excellent anti-backlash mechanism and add stability and smoother functionality to help solve backlash issues on your 3D printer. Lead Screw Top Mount: Made of premium aluminum alloy,it helps to keep the z-axis much more stable to minimize deviation while printing, and it minimizes the need to relevel the build plate between prints. Wide Compatibility: Work well with CR10,CR-10S,Ender-3 ,Ender 3S,Ender3 Pro and Ender 3 V2 3D Printer and other 3D printer which lead screw fixing holes is M3 and two holes distance 18mm. Great accessories Kit for 3d printer,offer more stable and convenient while in a print job. Colour: As shown Material: metal Package Contents: 1 * T8 anti backlash nuts 1 * lead screw top mount Only the above package content, other products are not included. Note: Light shooting 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.