Feature:1. T8 antibacklash spring and nut have standard size, suitable for 3D printer T8 lead screw.2. Made of highquality brass material, with high strength and hardness, and it is not easy to deform after longterm use.3. The thread specification is T-thread, and the nut is 8mm around one circle, and the workmanship is fine.4. The kit contains 4 nuts and 2 springs, so old or damaged parts can be replaced at any time.5. Can also be used for household CNC rolling mills for wood and plastic projectsSpecification:Item Type: Gap Eliminate NutThread Specification: T-threadDiameter: Approx. 8mm / 0.3inPitch: Approx. 2mm / 0.1inGuide Distance: Approx. 8mm / 0.3in(one turn of the nut).Package List:4 x Lead Nut 2 x Spring