Feature:1. Special anti reverse nut, highly precise of engraving machine, help improve work efficiency, printer first choic.2. Excellent anti recoiling mechanism, higher stability, smoother function, and help solve the recoiling problem three dimensional of printers.3. Made of brass material, not easy to rust, not easy to oxidize, corrosion resistant, sturdy and durable.4. Special anti backlash nut, used to disassemble the three dimensional printer, lead 8mm, durable and quiet.5. Excellent recoiling prevention mechanism, increased stability and smoother functions, help solve the printer's recoiling problem.Specification:Item Type:T8 Anti Backlash Spring nutMaterial: POM,BrassLead: Approx. 8mm / 0.3in.Package List:1 x Spring1 x Nut1 x Nut Base