ITEM NAME:T8 anti backlash spring loaded nut for 8mm threaded rod lead screwsJ Hn.Special anti backlash nut, high precision, low cost DIY engraving machine, 3D printer preferred. Item Type: 3D Printer T8 Anti-Backlash Nut. Suitable for 3D printer 8mm dia. 2mm pitch T8 threaded rod lead screw.